Heat transfer methods, systems and compositions

ABSTRACT

Disclosed are refrigerants comprising at least about 97% by weight of a blend of three compounds, said blend consisting of:
     from about 40% by weight to about 49% by weight difluoromethane (HFC-32),   from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125),   from about 33% by weight to about 40% by weight trifluoroiodomethane (CF 3 I); and   from about 2% by weight to about 12% by weight of trans 1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentages are based on the total weight of the three compounds in the blend, and systems and method using same.

CROSS REFERENCE TO RELATED APPLICATIONS

The present invention is related to as a continuation of PCT ApplicationNo. PCT/US17/44258, filed Jul. 27, 2017, which application is related toand claims the priority benefit of U.S. Provisional Application No.62/368,557, filed Jul. 29, 2016, both of which are incorporated hereinby reference.

FIELD OF THE INVENTION

The present invention relates to compositions, methods and systemshaving utility in heat exchange systems, including air conditioningapplications and in particular aspects to compositions useful in heattransfer systems of the type in which the refrigerant R-104A would haveheretofore been used, that is as a replacement of the refrigerant R-410Afor heating and cooling applications, and to retrofitting heat exchangesystems, including systems designed for use with R-410A.

BACKGROUND

Mechanical refrigeration systems, and related heat transfer devices,such as heat pumps and air conditioners, using refrigerant liquids arewell known in the art for industrial, commercial and domestic uses.Chlorofluorocarbons (CFCs) were developed in the 1930s as refrigerantsfor such systems. However, since the 1980s the effect of CFCs on thestratospheric ozone layer has become the focus of much attention. In1987, a number of governments signed the Montreal Protocol to protectthe global environment, setting forth a timetable for phasing out theCFC products. CFCs were replaced with more environmentally acceptablematerials that contain hydrogen, namely the hydrochlorofluorocarbons(HCFCs).

One of the most commonly used hydrochlorofluorocarbon refrigerants waschlorodifluoromethane (HCFC-22). However, subsequent amendments to theMontreal protocol accelerated the phase out of the CFCs and alsoscheduled the phase-out of HCFCs, including HCFC-22.

In response to the requirement for a non-flammable, non-toxicalternative to the CFCs and HCFCs, industry has developed a number ofhydrofluorocarbons (HFCs) which have zero ozone depletion potential.R-410A (a 50:50 w/w blend of difluoromethane (HFC-32) andpentafluoroethane (HFC-125)) was adopted as the industry replacement forHCFC-22 in air conditioning and chiller applications as it does notcontribute to ozone depletion. However, R-410A is not a drop-inreplacement for R22. Thus, the replacement of R-22 with R-410A requiredthe redesign of major components within heat exchange systems, includingthe replacement and redesign of the compressor to accommodate the higheroperating pressure and volumetric capacity of R-410A, when compared withR-22.

While R-410A has a more acceptable Ozone Depleting Potential (ODP) thanR-22, the continued use of R-410A is problematic, due to it's highGlobal Warming Potential of 2088. There is therefore a need in the artfor the replacement of R-410A with a more environmentally acceptablealternative.

It is understood in the art that it is highly desirable for areplacement heat transfer fluid to possess a difficult-to-achieve mosaicof properties, including excellent heat transfer properties, and inparticular heat transfer properties that are well matched to the needsof the particular application, chemical stability, low or no toxicity,non-flammability and/or lubricant compatibility amongst others. Inaddition, any replacement for R-410A would ideally be a good match forthe operating conditions of R-410A in order to avoid modification orredesign of the system. The development of a heat transfer fluid meetingall of these requirements, many of which are unpredictable, is asignificant challenge.

With regard to efficiency and use, it is important to note that a lossof refrigerant thermodynamic performance or energy efficiency may resultin an increase in fossil fuel usage as a result of the increased demandfor electrical energy. The use of such a refrigerant will therefore havea negative secondary environmental impact.

Flammability is considered to be an important, and in some cases, anessential property for many heat transfer applications Thus, it isfrequently beneficial to use compounds in such compositions, which arenon-flammable. As used herein, the term “non-flammable” refers tocompounds or compositions which are determined to be non-flammable inaccordance with ASTM standard E-681-2001 at conditions described in ASTMstandard E-681-2001 at conditions described in ASHRAE Standard 34-2013and described in Appendix B1 to ASHRAE Standard 34-2013.

US Patent Application 2011/0162410 describes a heat transfer compositionbased on three components: 1,3,3,3-tetrafluoropropene (R-1234ze), carbondioxide and a third component selected from difluoromethane (R-32),1,1-difluoroethane (R-152a), fluoroethane (R-161),1,1,1,2-tetrafluoroethane (R-134a), propylene (R-1270), propane (R-290)and mixtures thereof. This application discloses that the R-1234ze mustbe present in the compositions in an amount of at least about 45% byweight, that the CO2 is preferably present in an amount of from about 2%by weight to about 7% by weight, and that the third component is presentin an amount of less than 50% by weight. This application discloses thatthe refrigerant R-125 may also be included in amounts of less than about40% by weight. This application also discloses the possible use of afire retarding agent selected from the group consisting oftri-(2-chloroethyl)-phosphate, (chloropropyl)phosphate,tri-(2,3-dibromopropyl)-phosphate, tri-(1,3-dichloropropyl)-phosphate,diammonium phosphate, various halogenated aromatic compounds, antimonyoxide, aluminium trihydrate, polyvinyl chloride, a fluorinatediodocarbon, a fluorinated bromocarbon, trifluoro iodomethane,perfluoroalkyl amines, bromo-fluoroalkyl amines and mixtures thereof.Although this application also indicates that the disclosed compositionsare useful as low GWP replacements for a number of existingrefrigerants, such as R-134a, R-152a, R-1234yf, R-22, R-410A, R-407A,R-407B, R-407C, R507 and R-404a, it does not identify any particularrefrigerant for use as a replacement for R-410A.

Applicants have come to appreciate that the compositions disclosed in USPatent Application 2011/0162410 have several disadvantages in connectionwith potential use as a a refrigerant in systems of the type in whichR-410 A has heretofor been commonly used.

SUMMARY

Applicants have unexpectedly found that refrigerant compositionscomprising the following components in the following relative amountsovercome one or more of the disadvantages of prior refrigerantsdescribed herein:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze).

Applicants have found that the preferred refrigerants of the presentinvention are capable of providing exceptionally advantageous propertiesin connection with a combination of two or more of heat transferproperties, chemical stability, low or no toxicity, non-flammabilityand/or lubricant compatibility in combination with an acceptable GlobalWarming Potential (GWP), especially in connection with use as areplacement for R-410A.

Preferably, the refrigerant composition of the present invention issubstantially free of carbon dioxide. As used herein, the term“substantially free of carbon dioxide” means that the compositioncontains less than 1% by weight of carbon dioxide.

Preferably, the refrigerant composition of the present inventioncontains less than 0.5% by weight of carbon dioxide.

Preferably, the refrigerant composition of the present inventioncontains less than 0.2% by weight of carbon dioxide.

Preferably, the refrigerant comprises at least about 97% by weight of ablend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze).

Preferably, the refrigerant comprises at least about 98.5% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze).

Preferably, the refrigerant comprises at least about 99.5% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze).

Preferably, the refrigerant comprises at least about 97% by weight of ablend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2.

Preferably, the refrigerant comprises at least about 98.5% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2.

Preferably, the refrigerant comprises at least about 99.5% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises less than 0.2% by weight of CO2.

Preferably, the refrigerant consists essentially of a blend of thefollowing four compounds, with the following percentages being based onthe total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises less than 0.2% by weight of CO2.

More preferably, the refrigerant comprises at least about 97% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze).

More preferably, the refrigerant comprises at least about 98.5% byweight of a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze).

More preferably, the refrigerant comprises at least about 99.5% byweight of a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze).

More preferably, the refrigerant consists essentially of a blend of thefollowing four compounds, with the following percentages being based onthe total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze).

More preferably, the refrigerant consists of a blend of the followingfour compounds, with the following percentages being based on the totalweight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze).

More preferably, the refrigerant comprises at least about 97% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and

wherein the refrigerant is substantially free of CO2.

More preferably, the refrigerant comprises at least about 98.5% byweight of a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze) and

wherein the refrigerant is substantially free of CO2.

More preferably, the refrigerant comprises at least about 99.5% byweight of a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze) and

wherein the refrigerant contains less than 0.2% by weight of carbondioxide CO2.

More preferably, the refrigerant consists essentially of blend of thefollowing four compounds, with the following percentages being based onthe total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze) and

wherein the refrigerant is substantially free of CO2.

More preferably, the refrigerant consists essentially of blend of thefollowing four compounds, with the following percentages being based onthe total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze) and

wherein the refrigerant contains less than 0.2% by weight of CO2.

More preferably, the refrigerant comprises at least about 97% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds: about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze).

More preferably, the refrigerant comprises at least about 98.5% byweight of a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze).

More preferably, the refrigerant comprises at least about 99.5% byweight of a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze).

More preferably, the refrigerant consists essentially of a blend of thefollowing four compounds, with the following percentages being based onthe total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze).

More preferably, the refrigerant consists of a blend of the followingfour compounds, with the following percentages being based on the totalweight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze).

More preferably, the refrigerant comprises at least about 97% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds: about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze) and

wherein the refrigerant is substantially free of CO2.

More preferably, the refrigerant comprises at least about 98.5% byweight of a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze) and

wherein the refrigerant is substantially free of CO2.

More preferably, the refrigerant comprises at least about 99.5% byweight of a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze) and

wherein the refrigerant contains less than 0.2% by weight of carbondioxide CO2.

More preferably, the refrigerant consists essentially of a blend of thefollowing four compounds, with the following percentages being based onthe total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze) and

wherein the refrigerant is substantially free of CO2.

More preferably, the refrigerant consists of a blend of the followingfour compounds, with the following percentages being based on the totalweight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and

wherein the refrigerant contains less than 0.2% by weight of CO2.

DETAILED DESCRIPTION

It will be appreciated by the skilled person that the compound1,3,3,3-tetrafluoropropene (HFO-1234ze) can exist in two isomers, namelycis-1,3,3,3-tetrafluoropropene and trans-1,3,3,3-tetrafluoropropene.While, for the purposes of this invention, the1,3,3,3-tetrafluoropropene is provided as the trans isomer, the skilledperson will understand that small (i.e. impurity levels) of the cisisomer may be present. Thus, the 1,3,3,3-tetrafluoropropene preferablycomprises more than 99% trans 1,3,3,3-tetrafluoropropene, morepreferably the 1,3,3,3-tetrafluoropropene consists essentially of trans1,3,3,3-tetrafluoropropene, more preferably the1,3,3,3-tetrafluoropropene consists of trans 1,3,3,3-tetrafluoropropene.

Thus, the refrigerant of the present invention preferably comprises fromabout 40% by weight to about 49% by weight difluoromethane (HFC-32),preferably from about 46.5% by weight to about 48.5% by weightdifluoromethane (HFC-32), more preferably about 47.5% by weightdifluoromethane (HFC-32).

In addition, the refrigerant preferably comprises from about 16% byweight to about 12% by weight pentafluoroethane (HFC-125), preferablyfrom about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125), more preferably about 12% by weight pentafluoroethane(HFC-125),

In addition, the refrigerant preferably comprises from about 33% byweight to about 40% by weight trifluoroiodomethane (CF₃I), preferablyfrom about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I), more preferably about 36.5% by weight trifluoroiodomethane(CF₃I).

In addition, the refrigerant preferably comprises from about 2% byweight to about 12% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), preferably from about 2% by weight to about 5% by weight oftrans 1,3,3,3-tetrafluoropropene (trans HFO-1234ze), more preferablyabout 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze).

For the purposes of this invention, the term “about” in relation toamounts expressed in weight percent, means that the amount of thecomponent can vary by an amount of +/−2% by weight, preferably +/−1% byweight, and even more preferably +/−0.5% by weight. The term “about”, inrelation to temperatures, means that the stated temperature can vary byan amount of +/−5° C., preferably +/−2° C. and more preferably +/−1° C.,most preferably +/−0.5° C.

A particular advantage of the refrigerants of the present invention isthat they are non-flammable when tested in accordance with ASTME681-2009 test procedure as required in ASHRAE Standard 34-2013 anddescribed in Appendix B1 to ASHRAE Standard 34-2013. Flammability isdefined as the ability of a composition to ignite and/or propagate aflame. It will be appreciated by the skilled person that theflammability of a refrigerant is an important characteristic for use inheat transfer applications. Thus, it is a desire in the art to provide arefrigerant composition which can be used as a replacement for R-410Awhich has excellent heat transfer properties, chemical stability, low orno toxicity, and/or lubricant compatibility and which maintains nonflammability in use. This requirement is met by the refrigerants of thepresent invention.

The refrigerant can be incorporated into a heat transfer composition.

Thus, there is provided heat transfer compositions methods and systemswhich utilize in a heat transfer system that is useful with therefrigerant R-410A a refrigerant that has the important characteristicof at once providing in said system and/or in connection with saidmethods a refrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013. Such        refrigerant consists essentially of:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze).

There is provided heat transfer compositions, methods and systems whichutilize in a heat transfer system that is useful with the refrigerantR-410A a refrigerant that has the important characteristic of at onceproviding in said system and/or in connection with said methods arefrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013. Such        refrigerant consists essentially of:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze).

There is provided heat transfer compositions, methods and systems whichutilize in a heat transfer system that is useful with the refrigerantR-410A a refrigerant that has the important characteristic of at onceproviding in said system and/or in connection with said methods arefrigerant that:

(a) has an efficiency (COP) from about 95% to about 105%, preferablyabout 100% to about 105% of the efficiency of R410A in said systemand/or used in said method; and

(b) is non-flammable as determined in accordance with ASTM E681-2009test procedure as required in ASHRAE Standard 34-2013 and described inAppendix B1 to ASHRAE Standard 34-2013. Such refrigerant consistsessentially of:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze).

Thus, there is provided heat transfer compositions methods and systemswhich utilize in a heat transfer system that is useful with therefrigerant R-410A a refrigerant that has the important characteristicof at once providing in said system and/or in connection with saidmethods a refrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013. Such        refrigerant consists essentially of:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and wherein saidrefrigerant is substantially free of CO2.

There is provided heat transfer compositions, methods and systems whichutilize in a heat transfer system that is useful with the refrigerantR-410A a refrigerant that has the important characteristic of at onceproviding in said system and/or in connection with said methods arefrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013. Such        refrigerant consists essentially of:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and wherein saidrefrigerant is substantially free of CO2.

There is provided heat transfer compositions, methods and systems whichutilize in a heat transfer system that is useful with the refrigerantR-410A a refrigerant that has the important characteristic of at onceproviding in said system and/or in connection with said methods arefrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013. Such        refrigerant consists essentially of:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze) and wherein said refrigerant is substantially free of CO2.

Thus, there is provided the invention further relates to a heat transfercompositions methods and systems which utilize in a heat transfer systemthat is useful with the refrigerant R-410A a refrigerant that has theimportant characteristic of at once providing in said system and/or inconnection with said methods a refrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013. Such        refrigerant consists of:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze).

There is provided heat transfer compositions, methods and systems whichutilize in a heat transfer system that is useful with the refrigerantR-410A a refrigerant that has the important characteristic of at onceproviding in said system and/or in connection with said methods arefrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013. Such        refrigerant consists of:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze).

There is provided heat transfer compositions, methods and systems whichutilize in a heat transfer system that is useful with the refrigerantR-410A a refrigerant that has the important characteristic of at onceproviding in said system and/or in connection with said methods arefrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013. Such        refrigerant consists of:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF3I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze).

Thus, there is provided heat transfer compositions methods and systemswhich utilize in a heat transfer system that is useful with therefrigerant R-410A a refrigerant that has the important characteristicof at once providing in said system and/or in connection with saidmethods a refrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) has a capacity from about 95% to about 105%, preferably        about 98% to about 105% of the capacity of R410A in said system        and/or used in said method; and    -   (c) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013. Such        refrigerant consists essentially of:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze).

There is provided heat transfer compositions, methods and systems whichutilize in a heat transfer system that is useful with the refrigerantR-410A a refrigerant that has the important characteristic of at onceproviding in said system and/or in connection with said methods arefrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) has a capacity from about 95% to about 105%, preferably        about 98% to about 105% of the capacity of R410A in said system        and/or used in said method; and    -   (c) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013. Such        refrigerant consists essentially of:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze).

There is provided heat transfer compositions, methods and systems whichutilize in a heat transfer system that is useful with the refrigerantR-410A a refrigerant that has the important characteristic of at onceproviding in said system and/or in connection with said methods arefrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) has a capacity from about 95% to about 105%, preferably        about 98% to about 105% of the capacity of R410A in said system        and/or used in said method; and    -   (c) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013. Such        refrigerant consists essentially of:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze).

Thus, there is provided heat transfer compositions methods and systemswhich utilize in a heat transfer system that is useful with therefrigerant R-410A a refrigerant that has the important characteristicof at once providing in said system and/or in connection with saidmethods a refrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) has a capacity from about 95% to about 105%, preferably        about 98% to about 105% of the capacity of R410A in said system        and/or used in said method; and    -   (c) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013. Such        refrigerant consists essentially of:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and wherein saidrefrigerant is substantially free of CO2.

There is provided heat transfer compositions, methods and systems whichutilize in a heat transfer system that is useful with the refrigerantR-410A a refrigerant that has the important characteristic of at onceproviding in said system and/or in connection with said methods arefrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) has a capacity from about 95% to about 105%, preferably        about 98% to about 105% of the capacity of R410A in said system        and/or used in said method; and    -   (c) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013. Such        refrigerant consists essentially of:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and wherein saidrefrigerant is substantially free of CO2.

There is provided heat transfer compositions, methods and systems whichutilize in a heat transfer system that is useful with the refrigerantR-410A a refrigerant that has the important characteristic of at onceproviding in said system and/or in connection with said methods arefrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) has a capacity from about 95% to about 105%, preferably        about 98% to about 105% of the capacity of R410A in said system        and/or used in said method; and    -   (c) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013. Such        refrigerant consists essentially of:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze) and wherein said refrigerant is substantially free of CO2.

Thus, there is provided the invention further relates to a heat transfercompositions methods and systems which utilize in a heat transfer systemthat is useful with the refrigerant R-410A a refrigerant that has theimportant characteristic of at once providing in said system and/or inconnection with said methods a refrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) has a capacity from about 95% to about 105%, preferably        about 98% to about 105% of the capacity of R410A in said system        and/or used in said method; and    -   (c) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013. Such        refrigerant consists of:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze).

There is provided heat transfer compositions, methods and systems whichutilize in a heat transfer system that is useful with the refrigerantR-410A a refrigerant that has the important characteristic of at onceproviding in said system and/or in connection with said methods arefrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) has a capacity from about 95% to about 105%, preferably        about 98% to about 105% of the capacity of R410A in said system        and/or used in said method; and    -   (c) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013. Such        refrigerant consists of:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze).

There is provided heat transfer compositions, methods and systems whichutilize in a heat transfer system that is useful with the refrigerantR-410A a refrigerant that has the important characteristic of at onceproviding in said system and/or in connection with said methods arefrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method;    -   (b) has a capacity from about 95% to about 105%, preferably        about 98% to about 105% of the capacity of R410A in said system        and/or used in said method; and    -   (c) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013. Such        refrigerant consists of:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF3I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze).

Thus, there is provided heat transfer compositions methods and systemswhich utilize in a heat transfer system that is useful with therefrigerant R-410A a refrigerant that has the important characteristicof at once providing in said system and/or in connection with saidmethods a refrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) has a capacity from about 95% to about 105%, preferably        about 98% to about 105% of the capacity of R410A in said system        and/or used in said method; and    -   (c) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013;

(d) produces in the system and/or the methods a compressor dischargetemperature that is not greater than 10° C. higher than that of R-410A;and

-   -   (e) produces in the system and/or the methods a compressor        pressure ratio that is from about 95% to about 105% of the        compressor pressure ratio of R-410A. Such refrigerant consists        essentially of:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze).

There is provided heat transfer compositions, methods and systems whichutilize in a heat transfer system that is useful with the refrigerantR-410A a refrigerant that has the important characteristic of at onceproviding in said system and/or in connection with said methods arefrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) has a capacity from about 95% to about 105%, preferably        about 98% to about 105% of the capacity of R410A in said system        and/or used in said method; and    -   (c) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013;    -   (d) produces in the system and/or the methods a compressor        discharge temperature that is not greater than 10° C. higher        than that of R-410A; and    -   (e) produces in the system and/or the methods a compressor        pressure ratio that is from about 95% to about 105% of the        compressor pressure ratio of R-410A. Such refrigerant consists        essentially of:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze).

There is provided heat transfer compositions, methods and systems whichutilize in a heat transfer system that is useful with the refrigerantR-410A a refrigerant that has the important characteristic of at onceproviding in said system and/or in connection with said methods arefrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) has a capacity from about 95% to about 105%, preferably        about 98% to about 105% of the capacity of R410A in said system        and/or used in said method; and    -   (c) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013;    -   (d) produces in the system and/or the methods a compressor        discharge temperature that is not greater than 10° C. higher        than that of R-410A; and    -   (e) produces in the system and/or the methods a compressor        pressure ratio that is from about 95% to about 105% of the        compressor pressure ratio of R-410A. Such refrigerant consists        essentially of:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze).

Thus, there is provided heat transfer compositions methods and systemswhich utilize in a heat transfer system that is useful with therefrigerant R-410A a refrigerant that has the important characteristicof at once providing in said system and/or in connection with saidmethods a refrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) has a capacity from about 95% to about 105%, preferably        about 98% to about 105% of the capacity of R410A in said system        and/or used in said method; and    -   (c) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013;    -   (d) produces in the system and/or the methods a compressor        discharge temperature that is not greater than 10° C. higher        than that of R-410A; and    -   (e) produces in the system and/or the methods a compressor        pressure ratio that is from about 95% to about 105% of the        compressor pressure ratio of R-410A. Such refrigerant consists        essentially of:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and wherein saidrefrigerant is substantially free of CO2.

There is provided heat transfer compositions, methods and systems whichutilize in a heat transfer system that is useful with the refrigerantR-410A a refrigerant that has the important characteristic of at onceproviding in said system and/or in connection with said methods arefrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) has a capacity from about 95% to about 105%, preferably        about 98% to about 105% of the capacity of R410A in said system        and/or used in said method; and    -   (c) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013;    -   (d) produces in the system and/or the methods a compressor        discharge temperature that is not greater than 10° C. higher        than that of R-410A; and    -   (e) produces in the system and/or the methods a compressor        pressure ratio that is from about 95% to about 105% of the        compressor pressure ratio of R-410A. Such refrigerant consists        essentially of:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and wherein saidrefrigerant is substantially free of CO2.

There is provided heat transfer compositions, methods and systems whichutilize in a heat transfer system that is useful with the refrigerantR-410A a refrigerant that has the important characteristic of at onceproviding in said system and/or in connection with said methods arefrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) has a capacity from about 95% to about 105%, preferably        about 98% to about 105% of the capacity of R410A in said system        and/or used in said method; and    -   (c) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013;    -   (d) produces in the system and/or the methods a compressor        discharge temperature that is not greater than 10° C. higher        than that of R-410A; and    -   (e) produces in the system and/or the methods a compressor        pressure ratio that is from about 95% to about 105% of the        compressor pressure ratio of R-410A. Such refrigerant consists        essentially of:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze) and wherein said refrigerant is substantially free of CO2.

Thus, there is provided the invention further relates to a heat transfercompositions methods and systems which utilize in a heat transfer systemthat is useful with the refrigerant R-410A a refrigerant that has theimportant characteristic of at once providing in said system and/or inconnection with said methods a refrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) has a capacity from about 95% to about 105%, preferably        about 98% to about 105% of the capacity of R410A in said system        and/or used in said method; and    -   (c) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013;    -   (d) produces in the system and/or the methods a compressor        discharge temperature that is not greater than 10° C. higher        than that of R-410A; and    -   (e) produces in the system and/or the methods a compressor        pressure ratio that is from about 95% to about 105% of the        compressor pressure ratio of R-410A. Such refrigerant consists        of:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze).

There is provided heat transfer compositions, methods and systems whichutilize in a heat transfer system that is useful with the refrigerantR-410A a refrigerant that has the important characteristic of at onceproviding in said system and/or in connection with said methods arefrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) has a capacity from about 95% to about 105%, preferably        about 98% to about 105% of the capacity of R410A in said system        and/or used in said method; and    -   (c) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013;    -   (d) produces in the system and/or the methods a compressor        discharge temperature that is not greater than 10° C. higher        than that of R-410A; and    -   (e) produces in the system and/or the methods a compressor        pressure ratio that is from about 95% to about 105% of the        compressor pressure ratio of R-410A. Such refrigerant consists        of:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze).

There is provided heat transfer compositions, methods and systems whichutilize in a heat transfer system that is useful with the refrigerantR-410A a refrigerant that has the important characteristic of at onceproviding in said system and/or in connection with said methods arefrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method;    -   (b) has a capacity from about 95% to about 105%, preferably        about 98% to about 105% of the capacity of R410A in said system        and/or used in said method; and    -   (c) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013;    -   (d) produces in the system and/or the methods a compressor        discharge temperature that is not greater than 10° C. higher        than that of R-410A; and    -   (e) produces in the system and/or the methods a compressor        pressure ratio that is from about 95% to about 105% of the        compressor pressure ratio of R-410A. Such refrigerant consists        of:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF3I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze).

Thus, there is provided the invention further relates to a heat transfercompositions methods and systems which utilize in a heat transfer systemthat is useful with the refrigerant R-410A a refrigerant that has theimportant characteristic of at once providing in said system and/or inconnection with said methods a refrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) has a capacity from about 95% to about 105%, preferably        about 98% to about 105% of the capacity of R410A in said system        and/or used in said method; and    -   (c) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013;    -   (d) produces in the system and/or the methods a compressor        discharge temperature that is not greater than 10° C. higher        than that of R-410A; and    -   (e) produces in the system and/or the methods a compressor        pressure ratio that is from about 95% to about 105% of the        compressor pressure ratio of R-410A. Such refrigerant consists        of:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises less than 0.2% by weight of CO2.

There is provided heat transfer compositions, methods and systems whichutilize in a heat transfer system that is useful with the refrigerantR-410A a refrigerant that has the important characteristic of at onceproviding in said system and/or in connection with said methods arefrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method; and    -   (b) has a capacity from about 95% to about 105%, preferably        about 98% to about 105% of the capacity of R410A in said system        and/or used in said method; and    -   (c) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013;    -   (d) produces in the system and/or the methods a compressor        discharge temperature that is not greater than 10° C. higher        than that of R-410A; and    -   (e) produces in the system and/or the methods a compressor        pressure ratio that is from about 95% to about 105% of the        compressor pressure ratio of R-410A. Such refrigerant consists        of:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises less than 0.2% by weight of CO2.

There is provided heat transfer compositions, methods and systems whichutilize in a heat transfer system that is useful with the refrigerantR-410A a refrigerant that has the important characteristic of at onceproviding in said system and/or in connection with said methods arefrigerant that:

-   -   (a) has an efficiency (COP) from about 95% to about 105%,        preferably about 100% to about 105% of the efficiency of R410A        in said system and/or used in said method;    -   (b) has a capacity from about 95% to about 105%, preferably        about 98% to about 105% of the capacity of R410A in said system        and/or used in said method; and    -   (c) is non-flammable as determined in accordance with ASTM        E681-2009 test procedure as required in ASHRAE Standard 34-2013        and described in Appendix B1 to ASHRAE Standard 34-2013;    -   (d) produces in the system and/or the methods a compressor        discharge temperature that is not greater than 10° C. higher        than that of R-410A; and    -   (e) produces in the system and/or the methods a compressor        pressure ratio that is from

about 95% to about 105% of the compressor pressure ratio of R-410A. Suchrefrigerant consists of:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF3I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant comprises less than 0.2% by weightof CO2.

Preferably, the heat transfer composition comprises the refrigerant inan amount of greater than 40% by weight of the heat transfercomposition, or greater than 50% by weight of the heat transfercomposition or greater than 70% by weight of the heat transfercomposition, or greater than 80% by weight of the heat transfercomposition or greater than 90% by weight of the heat transfercomposition. The heat transfer composition may consist essentially ofthe refrigerant.

The heat transfer compositions of the invention may include othercomponents for the purpose of enhancing or providing certainfunctionality to the compositions. Such other components or additivesmay include one or more of lubricants, dyes, solubilizing agents,compatibilizers, stabilisers, antioxidants, corrosion inhibitors,extreme pressure additives and anti wear additives.

The heat transfer composition of the invention particularly comprises arefrigerant as discussed above and a stabilizer. Examples of preferredstabilizers include diene-based compounds and/or phenol-based compoundsand/or phosphorus compounds and/or nitrogen compounds and/or epoxidesselected from the group consisting of aromatic epoxides, alkyl epoxides,alkyenyl epoxides.

The stabilizer preferably is provided in the heat transfer compositionin an amount of from about 0.001% by weight to about 5% by weight,preferably about 0.01% by weight to about 2% by weight, more preferablyfrom about 0.1 to about 1% by weight. In each case, percentage by weightrefers to the weight of the heat transfer composition.

The diene-based compounds include C3 to C15 dienes and to compoundsformed by reaction of any two or more C3 to C4 dienes. Preferably, thediene based compounds are selected from the group consisting of allylethers, propadiene, butadiene, isoprene and terpenes. The diene-basedcompounds are preferably terpenes, which include but are not limited toterebene, retinal, geranoil, terpinene, delta-3 carene, terpinolene,phellandrene, fenchene, myrcene, farnesene, pinene, nerol, citral,camphor, menthol, limonene, nerolidol, phytol, carnosic acid and vitaminA₁. Preferably, the stabilizer is farnesene.

Preferred terpene stabilizers are disclosed in U.S. Provisional PatentApplication No. 60/638,003 filed on Dec. 12, 2004, which is incorporatedherein by reference.

The diene based compounds can be provided in the heat transfercomposition in an amount of from about 0.001% by weight to about 10% byweight, preferably about 0.01% by weight to about 5% by weight morepreferably from about 0.1 to about 2.5% by weight, and even morepreferably from about 1 to about 2.5% by weight. In each case,percentage by weight refers to the weight of the heat transfercomposition.

The diene based compounds can be provided in the heat transfercomposition in an amount of from about 0.001% by weight to about 5% byweight, preferably about 0.01% by weight to about 2% by weight, morepreferably from about 0.1 to about 1% by weight. In each case,percentage by weight refers to the weight of the heat transfercomposition.

The diene based compounds are preferably provided in combination with aphosphorous compound.

The phosphorus compound can be a phosphite or a phosphate compound. Forthe purposes of this invention, the phosphite compound can be a diaryl,dialkyl, triaryl and/or trialkyl phosphite, in particular one or morecompounds selected from hindered phosphites,tris-(di-tert-butylphenyl)phosphite, di-n-octyl phosphite, iso-decyldiphenyl phosphite and triphenyl phosphite and diphenyl phosphite,particularly diphenyl phosphite.

The phosphate compounds can be a triaryl phosphate, trialkyl phosphate,alkyl mono acid phosphate, aryl diacid phosphate, amine phosphate,preferably triaryl phosphate and/or a trialkyl phosphate, particularlytri-n-butyl phosphate.

Preferably the stabilizer comprises farnesene and diphenyl phosphite.

The phosphorus compounds can be provided in the heat transfercomposition in an amount of from about 0.001% by weight to about 10% byweight, more preferably about 0.01% by weight to about 5% by weight andeven more preferably from about 0.1 to about 2.5% by weight, and evenmore preferably from about 1 to about 2.5% by weight. In each case,percentage by weight refers to weight of the heat transfer composition.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 97% by weight of a blend ofthe following four compounds, with the following percentages being basedon the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising a terpene and a phosphorus compound. Thephosphorus compound is preferably selected from a phosphate or aphosphite. Preferably, the stabilizer composition comprises a terpeneand a phosphite, more preferably farnesene and diphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 98.5 by weight of a blendof the following four compounds, with the following percentages beingbased on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising a terpene and a phosphorus compound. Thephosphorus compound is preferably selected from a phosphate or aphosphite. Preferably, the stabilizer composition comprises a terpeneand a phosphite, more preferably farnesene and diphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 99.5 by weight of a blendof the following four compounds, with the following percentages beingbased on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising a terpene and a phosphorus compound. Thephosphorus compound is preferably selected from a phosphate or aphosphite. Preferably, the stabilizer composition comprises a terpeneand a phosphite, more preferably farnesene and diphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants consisting essentially of a blend of the followingfour compounds, with the following percentages being based on the totalweight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising a terpene and a phosphorus compound. Thephosphorus compound is preferably selected from a phosphate or aphosphite. Preferably, the stabilizer composition comprises a terpeneand a phosphite, more preferably farnesene and diphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants consisting essentially of a blend of the followingfour compounds, with the following percentages being based on the totalweight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising a terpene and a phosphorus compound. Thephosphorus compound is preferably selected from a phosphate or aphosphite. Preferably, the stabilizer composition comprises a terpeneand a phosphite, more preferably farnesene and diphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 97% by weight of a blend ofthe following four compounds, with the following percentages being basedon the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising a terpene and a phosphorus compound. Thephosphorus compound is preferably selected from a phosphate or aphosphite. Preferably, the stabilizer composition comprises a terpeneand a phosphite, more preferably farnesene and diphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 98.5% by weight of a blendof the following four compounds, with the following percentages beingbased on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising a terpene and a phosphorus compound. Thephosphorus compound is preferably selected from a phosphate or aphosphite. Preferably, the stabilizer composition comprises a terpeneand a phosphite, more preferably farnesene and diphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 99.5% by weight of a blendof the following four compounds, with the following percentages beingbased on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising a terpene and a phosphorus compound. Thephosphorus compound is preferably selected from a phosphate or aphosphite. Preferably, the stabilizer composition comprises a terpeneand a phosphite, more preferably farnesene and diphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants consisting essentially of a blend of the followingfour compounds, with the following percentages being based on the totalweight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising a terpene and a phosphorus compound. Thephosphorus compound is preferably selected from a phosphate or aphosphite. Preferably, the stabilizer composition comprises a terpeneand a phosphite, more preferably farnesene and diphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants consisting of a blend of the following fourcompounds, with the following percentages being based on the totalweight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising a terpene and a phosphorus compound. Thephosphorus compound is preferably selected from a phosphate or aphosphite. Preferably, the stabilizer composition comprises a terpeneand a phosphite, more preferably farnesene and diphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 97% by weight of a blend ofthe following four compounds, with the following percentages being basedon the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze),

and a stabilizer composition comprising a terpene and a phosphoruscompound. The phosphorus compound is preferably selected from aphosphate or a phosphite. Preferably, the stabilizer compositioncomprises a terpene and a phosphite, more preferably farnesene anddiphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 98.5% by weight of a blendof the following four compounds, with the following percentages beingbased on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze),

and a stabilizer composition comprising a terpene and a phosphoruscompound. The phosphorus compound is preferably selected from aphosphate or a phosphite. Preferably, the stabilizer compositioncomprises a terpene and a phosphite, more preferably farnesene anddiphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 99.5% by weight of a blendof the following four compounds, with the following percentages beingbased on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze),

and a stabilizer composition comprising a terpene and a phosphoruscompound. The phosphorus compound is preferably selected from aphosphate or a phosphite. Preferably, the stabilizer compositioncomprises a terpene and a phosphite, more preferably farnesene anddiphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants consisting essentially of a blend of the followingfour compounds, with the following percentages being based on the totalweight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze),

and a stabilizer composition comprising a terpene and a phosphoruscompound. The phosphorus compound is preferably selected from aphosphate or a phosphite. Preferably, the stabilizer compositioncomprises a terpene and a phosphite, more preferably farnesene anddiphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants consisting of a blend of the following fourcompounds, with the following percentages being based on the totalweight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze),

and a stabilizer composition comprising a terpene and a phosphoruscompound. The phosphorus compound is preferably selected from aphosphate or a phosphite. Preferably, the stabilizer compositioncomprises a terpene and a phosphite, more preferably farnesene anddiphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 97% by weight of a blend ofthe following four compounds, with the following percentages being basedon the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprising aterpene and a phosphorus compound. The phosphorus compound is preferablyselected from a phosphate or a phosphite. Preferably, the stabilizercomposition comprises a terpene and a phosphite, more preferablyfarnesene and diphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 98.5 by weight of a blendof the following four compounds, with the following percentages beingbased on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprising aterpene and a phosphorus compound. The phosphorus compound is preferablyselected from a phosphate or a phosphite. Preferably, the stabilizercomposition comprises a terpene and a phosphite, more preferablyfarnesene and diphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 99.5 by weight of a blendof the following four compounds, with the following percentages beingbased on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises not more than 0.2% by weight of CO2, and a stabilizercomposition comprising a terpene and a phosphorus compound. Thephosphorus compound is preferably selected from a phosphate or aphosphite. Preferably, the stabilizer composition comprises a terpeneand a phosphite, more preferably farnesene and diphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants consisting essentially of a blend of the followingfour compounds, with the following percentages being based on the totalweight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprising aterpene and a phosphorus compound. The phosphorus compound is preferablyselected from a phosphate or a phosphite. Preferably, the stabilizercomposition comprises a terpene and a phosphite, more preferablyfarnesene and diphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants consisting of a blend of the following fourcompounds, with the following percentages being based on the totalweight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises not more than 0.2% by weight of CO2, and a stabilizercomposition comprising a terpene and a phosphorus compound. Thephosphorus compound is preferably selected from a phosphate or aphosphite. Preferably, the stabilizer composition comprises a terpeneand a phosphite, more preferably farnesene and diphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 97% by weight of a blend ofthe following four compounds, with the following percentages being basedon the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprising aterpene and a phosphorus compound. The phosphorus compound is preferablyselected from a phosphate or a phosphite. Preferably, the stabilizercomposition comprises a terpene and a phosphite, more preferablyfarnesene and diphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 98.5% by weight of a blendof the following four compounds, with the following percentages beingbased on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprising aterpene and a phosphorus compound. The phosphorus compound is preferablyselected from a phosphate or a phosphite. Preferably, the stabilizercomposition comprises a terpene and a phosphite, more preferablyfarnesene and diphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 99.5% by weight of a blendof the following four compounds, with the following percentages beingbased on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises not more than 0.2% by weight of CO2, and a stabilizercomposition comprising a terpene and a phosphorus compound. Thephosphorus compound is preferably selected from a phosphate or aphosphite. Preferably, the stabilizer composition comprises a terpeneand a phosphite, more preferably farnesene and diphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants consisting essentially of a blend of the followingfour compounds, with the following percentages being based on the totalweight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprising aterpene and a phosphorus compound. The phosphorus compound is preferablyselected from a phosphate or a phosphite. Preferably, the stabilizercomposition comprises a terpene and a phosphite, more preferablyfarnesene and diphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants consisting of a blend of the following fourcompounds, with the following percentages being based on the totalweight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises not more than 0.2% by weight of CO2, and a stabilizercomposition comprising a terpene and a phosphorus compound. Thephosphorus compound is preferably selected from a phosphate or aphosphite. Preferably, the stabilizer composition comprises a terpeneand a phosphite, more preferably farnesene and diphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 97% by weight of a blend ofthe following four compounds, with the following percentages being basedon the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant is substantially free of CO2,

and a stabilizer composition comprising a terpene and a phosphoruscompound. The phosphorus compound is preferably selected from aphosphate or a phosphite. Preferably, the stabilizer compositioncomprises a terpene and a phosphite, more preferably farnesene anddiphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 98.5% by weight of a blendof the following four compounds, with the following percentages beingbased on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant is substantially free of CO2,

and a stabilizer composition comprising a terpene and a phosphoruscompound. The phosphorus compound is preferably selected from aphosphate or a phosphite. Preferably, the stabilizer compositioncomprises a terpene and a phosphite, more preferably farnesene anddiphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 99.5% by weight of a blendof the following four compounds, with the following percentages beingbased on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant comprises not more than 0.2% byweight of CO2,

and a stabilizer composition comprising a terpene and a phosphoruscompound. The phosphorus compound is preferably selected from aphosphate or a phosphite. Preferably, the stabilizer compositioncomprises a terpene and a phosphite, more preferably farnesene anddiphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants consisting essentially of a blend of the followingfour compounds, with the following percentages being based on the totalweight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant is substantially free of CO2,

and a stabilizer composition comprising a terpene and a phosphoruscompound. The phosphorus compound is preferably selected from aphosphate or a phosphite. Preferably, the stabilizer compositioncomprises a terpene and a phosphite, more preferably farnesene anddiphenyl phosphite.

The heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants consisting of a blend of the following fourcompounds, with the following percentages being based on the totalweight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant comprises not more than 0.2% byweight of CO2,

and a stabilizer composition comprising a terpene and a phosphoruscompound. The phosphorus compound is preferably selected from aphosphate or a phosphite. Preferably, the stabilizer compositioncomprises a terpene and a phosphite, more preferably farnesene anddiphenyl phosphite.

Preferably, the heat transfer composition comprises a refrigerant as setout above and a stabilizer composition comprising farnesene and aphosphorous compound selected from a diaryl phosphite, a dialkylphosphite, a triaryl phosphate or a trialkyl phosphate, more preferablydiphenyl phosphite and/or tri-n-butyl phosphate. More preferably theheat transfer composition comprises a refrigerant as described hereinand a stabilizer composition comprising farnesene and one or more of adiaryl phosphite or a dialkyl phosphite, more preferably diphenylphosphite.

Alternatively or in addition, the stabilizer is a nitrogen compound. Forthe purposes of this invention, the nitrogen compound can be one or morecompounds selected from dinitrobenzene, nitrobenzene, nitromethane,nitrosobenzene, and TEMPO [(2,2,6,6-tetramethylpiperidin-1-yl)oxyl].Preferably, the stabilizer is dinitrobenzene.

Alternatively or in addition, the nitrogen compound comprises an aminebased compound. For the purposes of this invention, the amine basedcompound can be one or more secondary or tertiary amines selected fromdiphenylamine, p-phenylenediamine, triethylamine, tributylamine,diisopropylamine, triisopropylamine and triisobutylamine. For thepurposes of this invention, the amine based compound can be an amineantioxidant such as a substituted piperidine compound, i.e. a derivativeof an alkyl substituted piperidyl, piperidinyl, piperazinone, oralkyoxypiperidinyl, particularly one or more amine antioxidants selectedfrom 2,2,6,6-tetramethyl-4-piperidone,2,2,6,6-tetramethyl-4-piperidinol;bis-(1,2,2,6,6-pentamethylpiperidyl)sebacate;di(2,2,6,6-tetramethyl-4-piperidyl)sebacate,poly(N-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate;alkylated paraphenylenediamines such asN-phenyl-N′-(1,3-dimethyl-butyl)-p-phenylenediamine orN,N′-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallowamines, methyl bis tallow amine and bis tallow amine, orphenol-alpha-napththylamine or Tinuvin® 765 (Ciba), BLS® 1944 (MayzoInc) and BLS® 1770 (Mayzo Inc). For the purposes of this invention, theamine based compound can be an alkyldiphenyl amine such as bis(nonylphenyl amine) or a dialkylamine such as(N-(1-methylethyl)-2-propylamine. Alternatively or in addition, theamine based compound can be one or more of phenyl-alpha-naphthyl amine(PANA), alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl)amine. Preferably the amine based compound is one or more ofphenyl-alpha-naphthyl amine (PANA), alkyl-phenyl-alpha-naphthyl-amine(APANA) and bis (nonylphenyl) amine, more preferablyphenyl-alpha-naphthyl amine (PANA).

The nitrogen compounds can be provided in the heat transfer composition,including in any of the heat transfer compositions described herein, inan amount of from about 0.001% by weight to about 10% by weight,preferably about 0.01% by weight to about 5% by weight, more preferablyfrom about 0.1 to about 2.5% by weight, and even more preferably fromabout 1 to about 2.5% by weight. In each case, percentage by weightrefers to weight of the heat transfer composition.

In addition, the nitrogen compounds can be provided in the heat transfercomposition in an amount of from about 0.001% by weight to about 5% byweight, preferably about 0.01% by weight to about 2% by weight, morepreferably from about 0.1 to about 1% by weight. In each case,percentage by weight refers to weight of the heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising a nitrogen compound selected from dinitrobenzene,nitrobenzene, nitromethane, nitrosobenzene, TEMPO[(2,2,6,6-tetramethylpiperidin-1-yl)oxyl], a secondary or tertiary amineselected from diphenylamine, p-phenylenediamine, triethylamine,tributylamine, diisopropylamine, triisopropylamine and triisobutylamine;an amine antioxidant such as a substituted piperidine compound, i.e. aderivative of an alkyl substituted piperidyl, piperidinyl, piperazinone,or alkyoxypiperidinyl, selected from 2,2,6,6-tetramethyl-4-piperidone,2,2,6,6-tetramethyl-4-piperidinol;bis-(1,2,2,6,6-pentamethylpiperidyl)sebacate;di(2,2,6,6-tetramethyl-4-piperidyl)sebacate,poly(N-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate;alkylated paraphenylenediamines such asN-phenyl-N′-(1,3-dimethyl-butyl)-p-phenylenediamine orN,N′-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallowamines, methyl bis tallow amine and bis tallow amine, orphenol-alpha-napththylamine or Tinuvin® 765 (Ciba), BLS® 1944 (MayzoInc) and BLS® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis(nonylphenyl amine), a dialkylamine such as(N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,preferably phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,more preferably phenyl-alpha-naphthyl amine (PANA).

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising a nitrogen compound selected from dinitrobenzene,nitrobenzene, nitromethane, nitrosobenzene, TEMPO[(2,2,6,6-tetramethylpiperidin-1-yl)oxyl], a secondary or tertiary amineselected from diphenylamine, p-phenylenediamine, triethylamine,tributylamine, diisopropylamine, triisopropylamine and triisobutylamine;an amine antioxidant such as a substituted piperidine compound, i.e. aderivative of an alkyl substituted piperidyl, piperidinyl, piperazinone,or alkyoxypiperidinyl, selected from 2,2,6,6-tetramethyl-4-piperidone,2,2,6,6-tetramethyl-4-piperidinol;bis-(1,2,2,6,6-pentamethylpiperidyl)sebacate;di(2,2,6,6-tetramethyl-4-piperidyl)sebacate,poly(N-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate;alkylated paraphenylenediamines such asN-phenyl-N′-(1,3-dimethyl-butyl)-p-phenylenediamine orN,N′-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallowamines, methyl bis tallow amine and bis tallow amine, orphenol-alpha-napththylamine or Tinuvin® 765 (Ciba), BLS® 1944 (MayzoInc) and BLS® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis(nonylphenyl amine), a dialkylamine such as(N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,preferably phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,more preferably phenyl-alpha-naphthyl amine (PANA).

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising a nitrogen compound selected from dinitrobenzene,nitrobenzene, nitromethane, nitrosobenzene, TEMPO[(2,2,6,6-tetramethylpiperidin-1-yl)oxyl], a secondary or tertiary amineselected from diphenylamine, p-phenylenediamine, triethylamine,tributylamine, diisopropylamine, triisopropylamine and triisobutylamine;an amine antioxidant such as a substituted piperidine compound, i.e. aderivative of an alkyl substituted piperidyl, piperidinyl, piperazinone,or alkyoxypiperidinyl, selected from 2,2,6,6-tetramethyl-4-piperidone,2,2,6,6-tetramethyl-4-piperidinol;bis-(1,2,2,6,6-pentamethylpiperidyl)sebacate;di(2,2,6,6-tetramethyl-4-piperidyl)sebacate,poly(N-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate;alkylated paraphenylenediamines such asN-phenyl-N′-(1,3-dimethyl-butyl)-p-phenylenediamine orN,N′-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallowamines, methyl bis tallow amine and bis tallow amine, orphenol-alpha-napththylamine or Tinuvin® 765 (Ciba), BLS® 1944 (MayzoInc) and BLS® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis(nonylphenyl amine), a dialkylamine such as(N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,preferably phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,more preferably phenyl-alpha-naphthyl amine (PANA).

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising a nitrogen compound selected from dinitrobenzene,nitrobenzene, nitromethane, nitrosobenzene, TEMPO[(2,2,6,6-tetramethylpiperidin-1-yl)oxyl], a secondary or tertiary amineselected from diphenylamine, p-phenylenediamine, triethylamine,tributylamine, diisopropylamine, triisopropylamine and triisobutylamine;an amine antioxidant such as a substituted piperidine compound, i.e. aderivative of an alkyl substituted piperidyl, piperidinyl, piperazinone,or alkyoxypiperidinyl, selected from 2,2,6,6-tetramethyl-4-piperidone,2,2,6,6-tetramethyl-4-piperidinol;bis-(1,2,2,6,6-pentamethylpiperidyl)sebacate;di(2,2,6,6-tetramethyl-4-piperidyl)sebacate,poly(N-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate;alkylated paraphenylenediamines such asN-phenyl-N′-(1,3-dimethyl-butyl)-p-phenylenediamine orN,N′-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallowamines, methyl bis tallow amine and bis tallow amine, orphenol-alpha-napththylamine or Tinuvin® 765 (Ciba), BLS® 1944 (MayzoInc) and BLS® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis(nonylphenyl amine), a dialkylamine such as(N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,preferably phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,more preferably phenyl-alpha-naphthyl amine (PANA).

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising a nitrogen compound selected from dinitrobenzene,nitrobenzene, nitromethane, nitrosobenzene, TEMPO[(2,2,6,6-tetramethylpiperidin-1-yl)oxyl], a secondary or tertiary amineselected from diphenylamine, p-phenylenediamine, triethylamine,tributylamine, diisopropylamine, triisopropylamine and triisobutylamine;an amine antioxidant such as a substituted piperidine compound, i.e. aderivative of an alkyl substituted piperidyl, piperidinyl, piperazinone,or alkyoxypiperidinyl, selected from 2,2,6,6-tetramethyl-4-piperidone,2,2,6,6-tetramethyl-4-piperidinol;bis-(1,2,2,6,6-pentamethylpiperidyl)sebacate;di(2,2,6,6-tetramethyl-4-piperidyl)sebacate,poly(N-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate;alkylated paraphenylenediamines such asN-phenyl-N′-(1,3-dimethyl-butyl)-p-phenylenediamine orN,N′-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallowamines, methyl bis tallow amine and bis tallow amine, orphenol-alpha-napththylamine or Tinuvin® 765 (Ciba), BLS® 1944 (MayzoInc) and BLS® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis(nonylphenyl amine), a dialkylamine such as(N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,preferably phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,more preferably phenyl-alpha-naphthyl amine (PANA).

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising a nitrogen compound selected from dinitrobenzene,nitrobenzene, nitromethane, nitrosobenzene, TEMPO[(2,2,6,6-tetramethylpiperidin-1-yl)oxyl], a secondary or tertiary amineselected from diphenylamine, p-phenylenediamine, triethylamine,tributylamine, diisopropylamine, triisopropylamine and triisobutylamine;an amine antioxidant such as a substituted piperidine compound, i.e. aderivative of an alkyl substituted piperidyl, piperidinyl, piperazinone,or alkyoxypiperidinyl, selected from 2,2,6,6-tetramethyl-4-piperidone,2,2,6,6-tetramethyl-4-piperidinol;bis-(1,2,2,6,6-pentamethylpiperidyl)sebacate;di(2,2,6,6-tetramethyl-4-piperidyl)sebacate,poly(N-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate;alkylated paraphenylenediamines such asN-phenyl-N′-(1,3-dimethyl-butyl)-p-phenylenediamine orN,N′-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallowamines, methyl bis tallow amine and bis tallow amine, orphenol-alpha-napththylamine or Tinuvin® 765 (Ciba), BLS® 1944 (MayzoInc) and BLS® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis(nonylphenyl amine), a dialkylamine such as(N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,preferably phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,more preferably phenyl-alpha-naphthyl amine (PANA).

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and a stabilizer composition comprising a nitrogen compoundselected from dinitrobenzene, nitrobenzene, nitromethane,nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1-yl)oxyl], asecondary or tertiary amine selected from diphenylamine,p-phenylenediamine, triethylamine, tributylamine, diisopropylamine,triisopropylamine and triisobutylamine; an amine antioxidant such as asubstituted piperidine compound, i.e. a derivative of an alkylsubstituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl,selected from 2,2,6,6-tetramethyl-4-piperidone,2,2,6,6-tetramethyl-4-piperidinol;bis-(1,2,2,6,6-pentamethylpiperidyl)sebacate;di(2,2,6,6-tetramethyl-4-piperidyl)sebacate,poly(N-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate;alkylated paraphenylenediamines such asN-phenyl-N′-(1,3-dimethyl-butyl)-p-phenylenediamine orN,N′-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallowamines, methyl bis tallow amine and bis tallow amine, orphenol-alpha-napththylamine or Tinuvin® 765 (Ciba), BLS® 1944 (MayzoInc) and BLS® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis(nonylphenyl amine), a dialkylamine such as(N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,preferably phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,more preferably phenyl-alpha-naphthyl amine (PANA).

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and a stabilizer composition comprising a nitrogen compoundselected from dinitrobenzene, nitrobenzene, nitromethane,nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1-yl)oxyl], asecondary or tertiary amine selected from diphenylamine,p-phenylenediamine, triethylamine, tributylamine, diisopropylamine,triisopropylamine and triisobutylamine; an amine antioxidant such as asubstituted piperidine compound, i.e. a derivative of an alkylsubstituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl,selected from 2,2,6,6-tetramethyl-4-piperidone,2,2,6,6-tetramethyl-4-piperidinol;bis-(1,2,2,6,6-pentamethylpiperidyl)sebacate;di(2,2,6,6-tetramethyl-4-piperidyl)sebacate,poly(N-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate;alkylated paraphenylenediamines such asN-phenyl-N′-(1,3-dimethyl-butyl)-p-phenylenediamine orN,N′-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallowamines, methyl bis tallow amine and bis tallow amine, orphenol-alpha-napththylamine or Tinuvin® 765 (Ciba), BLS® 1944 (MayzoInc) and BLS® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis(nonylphenyl amine), a dialkylamine such as(N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,preferably phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,more preferably phenyl-alpha-naphthyl amine (PANA).

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and a stabilizer composition comprising a nitrogen compoundselected from dinitrobenzene, nitrobenzene, nitromethane,nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1-yl)oxyl], asecondary or tertiary amine selected from diphenylamine,p-phenylenediamine, triethylamine, tributylamine, diisopropylamine,triisopropylamine and triisobutylamine; an amine antioxidant such as asubstituted piperidine compound, i.e. a derivative of an alkylsubstituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl,selected from 2,2,6,6-tetramethyl-4-piperidone,2,2,6,6-tetramethyl-4-piperidinol;bis-(1,2,2,6,6-pentamethylpiperidyl)sebacate;di(2,2,6,6-tetramethyl-4-piperidyl)sebacate,poly(N-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate;alkylated paraphenylenediamines such asN-phenyl-N′-(1,3-dimethyl-butyl)-p-phenylenediamine orN,N′-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallowamines, methyl bis tallow amine and bis tallow amine, orphenol-alpha-napththylamine or Tinuvin® 765 (Ciba), BLS® 1944 (MayzoInc) and BLS® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis(nonylphenyl amine), a dialkylamine such as(N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,preferably phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,more preferably phenyl-alpha-naphthyl amine (PANA).

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprising anitrogen compound selected from dinitrobenzene, nitrobenzene,nitromethane, nitrosobenzene, TEMPO[(2,2,6,6-tetramethylpiperidin-1-yl)oxyl], a secondary or tertiary amineselected from diphenylamine, p-phenylenediamine, triethylamine,tributylamine, diisopropylamine, triisopropylamine and triisobutylamine;an amine antioxidant such as a substituted piperidine compound, i.e. aderivative of an alkyl substituted piperidyl, piperidinyl, piperazinone,or alkyoxypiperidinyl, selected from 2,2,6,6-tetramethyl-4-piperidone,2,2,6,6-tetramethyl-4-piperidinol;bis-(1,2,2,6,6-pentamethylpiperidyl)sebacate;di(2,2,6,6-tetramethyl-4-piperidyl)sebacate,poly(N-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate;alkylated paraphenylenediamines such asN-phenyl-N′-(1,3-dimethyl-butyl)-p-phenylenediamine orN,N′-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallowamines, methyl bis tallow amine and bis tallow amine, orphenol-alpha-napththylamine or Tinuvin® 765 (Ciba), BLS® 1944 (MayzoInc) and BLS® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis(nonylphenyl amine), a dialkylamine such as(N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,preferably phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,more preferably phenyl-alpha-naphthyl amine (PANA).

In addition, the nitrogen compounds can be provided in the heat transfercomposition in an amount of from about 0.001% by weight to about 5% byweight, preferably about 0.01% by weight to about 2% by weight, morepreferably from about 0.1 to about 1% by weight. In each case,percentage by weight refers to weight of the heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprising anitrogen compound selected from dinitrobenzene, nitrobenzene,nitromethane, nitrosobenzene, TEMPO[(2,2,6,6-tetramethylpiperidin-1-yl)oxyl], a secondary or tertiary amineselected from diphenylamine, p-phenylenediamine, triethylamine,tributylamine, diisopropylamine, triisopropylamine and triisobutylamine;an amine antioxidant such as a substituted piperidine compound, i.e. aderivative of an alkyl substituted piperidyl, piperidinyl, piperazinone,or alkyoxypiperidinyl, selected from 2,2,6,6-tetramethyl-4-piperidone,2,2,6,6-tetramethyl-4-piperidinol;bis-(1,2,2,6,6-pentamethylpiperidyl)sebacate;di(2,2,6,6-tetramethyl-4-piperidyl)sebacate,poly(N-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate;alkylated paraphenylenediamines such asN-phenyl-N′-(1,3-dimethyl-butyl)-p-phenylenediamine orN,N′-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallowamines, methyl bis tallow amine and bis tallow amine, orphenol-alpha-napththylamine or Tinuvin® 765 (Ciba), BLS® 1944 (MayzoInc) and BLS® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis(nonylphenyl amine), a dialkylamine such as(N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,preferably phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,more preferably phenyl-alpha-naphthyl amine (PANA).

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises less than 0.2% by weight of CO2, and a stabilizer compositioncomprising a nitrogen compound selected from dinitrobenzene,nitrobenzene, nitromethane, nitrosobenzene, TEMPO[(2,2,6,6-tetramethylpiperidin-1-yl)oxyl], a secondary or tertiary amineselected from diphenylamine, p-phenylenediamine, triethylamine,tributylamine, diisopropylamine, triisopropylamine and triisobutylamine;an amine antioxidant such as a substituted piperidine compound, i.e. aderivative of an alkyl substituted piperidyl, piperidinyl, piperazinone,or alkyoxypiperidinyl, selected from 2,2,6,6-tetramethyl-4-piperidone,2,2,6,6-tetramethyl-4-piperidinol;bis-(1,2,2,6,6-pentamethylpiperidyl)sebacate;di(2,2,6,6-tetramethyl-4-piperidyl)sebacate,poly(N-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate;alkylated paraphenylenediamines such asN-phenyl-N′-(1,3-dimethyl-butyl)-p-phenylenediamine orN,N′-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallowamines, methyl bis tallow amine and bis tallow amine, orphenol-alpha-napththylamine or Tinuvin® 765 (Ciba), BLS® 1944 (MayzoInc) and BLS® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis(nonylphenyl amine), a dialkylamine such as(N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,preferably phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,more preferably phenyl-alpha-naphthyl amine (PANA).

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprising anitrogen compound selected from dinitrobenzene, nitrobenzene,nitromethane, nitrosobenzene, TEMPO[(2,2,6,6-tetramethylpiperidin-1-yl)oxyl], a secondary or tertiary amineselected from diphenylamine, p-phenylenediamine, triethylamine,tributylamine, diisopropylamine, triisopropylamine and triisobutylamine;an amine antioxidant such as a substituted piperidine compound, i.e. aderivative of an alkyl substituted piperidyl, piperidinyl, piperazinone,or alkyoxypiperidinyl, selected from 2,2,6,6-tetramethyl-4-piperidone,2,2,6,6-tetramethyl-4-piperidinol;bis-(1,2,2,6,6-pentamethylpiperidyl)sebacate;di(2,2,6,6-tetramethyl-4-piperidyl)sebacate,poly(N-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate;alkylated paraphenylenediamines such asN-phenyl-N′-(1,3-dimethyl-butyl)-p-phenylenediamine orN,N′-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallowamines, methyl bis tallow amine and bis tallow amine, orphenol-alpha-napththylamine or Tinuvin® 765 (Ciba), BLS® 1944 (MayzoInc) and BLS® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis(nonylphenyl amine), a dialkylamine such as(N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,preferably phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,more preferably phenyl-alpha-naphthyl amine (PANA).

In addition, the nitrogen compounds can be provided in the heat transfercomposition in an amount of from about 0.001% by weight to about 5% byweight, preferably about 0.01% by weight to about 2% by weight, morepreferably from about 0.1 to about 1% by weight. In each case,percentage by weight refers to weight of the heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprising anitrogen compound selected from dinitrobenzene, nitrobenzene,nitromethane, nitrosobenzene, TEMPO[(2,2,6,6-tetramethylpiperidin-1-yl)oxyl], a secondary or tertiary amineselected from diphenylamine, p-phenylenediamine, triethylamine,tributylamine, diisopropylamine, triisopropylamine and triisobutylamine;an amine antioxidant such as a substituted piperidine compound, i.e. aderivative of an alkyl substituted piperidyl, piperidinyl, piperazinone,or alkyoxypiperidinyl, selected from 2,2,6,6-tetramethyl-4-piperidone,2,2,6,6-tetramethyl-4-piperidinol;bis-(1,2,2,6,6-pentamethylpiperidyl)sebacate;di(2,2,6,6-tetramethyl-4-piperidyl)sebacate,poly(N-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate;alkylated paraphenylenediamines such asN-phenyl-N′-(1,3-dimethyl-butyl)-p-phenylenediamine orN,N′-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallowamines, methyl bis tallow amine and bis tallow amine, orphenol-alpha-napththylamine or Tinuvin® 765 (Ciba), BLS® 1944 (MayzoInc) and BLS® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis(nonylphenyl amine), a dialkylamine such as(N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,preferably phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,more preferably phenyl-alpha-naphthyl amine (PANA).

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises less than 0.2% by weight of CO2, and a stabilizer compositioncomprising a nitrogen compound selected from dinitrobenzene,nitrobenzene, nitromethane, nitrosobenzene, TEMPO[(2,2,6,6-tetramethylpiperidin-1-yl)oxyl], a secondary or tertiary amineselected from diphenylamine, p-phenylenediamine, triethylamine,tributylamine, diisopropylamine, triisopropylamine and triisobutylamine;an amine antioxidant such as a substituted piperidine compound, i.e. aderivative of an alkyl substituted piperidyl, piperidinyl, piperazinone,or alkyoxypiperidinyl, selected from 2,2,6,6-tetramethyl-4-piperidone,2,2,6,6-tetramethyl-4-piperidinol;bis-(1,2,2,6,6-pentamethylpiperidyl)sebacate;di(2,2,6,6-tetramethyl-4-piperidyl)sebacate,poly(N-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate;alkylated paraphenylenediamines such asN-phenyl-N′-(1,3-dimethyl-butyl)-p-phenylenediamine orN,N′-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallowamines, methyl bis tallow amine and bis tallow amine, orphenol-alpha-napththylamine or Tinuvin® 765 (Ciba), BLS® 1944 (MayzoInc) and BLS® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis(nonylphenyl amine), a dialkylamine such as(N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,preferably phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,more preferably phenyl-alpha-naphthyl amine (PANA).

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant is substantially free of CO2, and astabilizer composition comprising a nitrogen compound selected fromdinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO[(2,2,6,6-tetramethylpiperidin-1-yl)oxyl], a secondary or tertiary amineselected from diphenylamine, p-phenylenediamine, triethylamine,tributylamine, diisopropylamine, triisopropylamine and triisobutylamine;an amine antioxidant such as a substituted piperidine compound, i.e. aderivative of an alkyl substituted piperidyl, piperidinyl, piperazinone,or alkyoxypiperidinyl, selected from 2,2,6,6-tetramethyl-4-piperidone,2,2,6,6-tetramethyl-4-piperidinol;bis-(1,2,2,6,6-pentamethylpiperidyl)sebacate;di(2,2,6,6-tetramethyl-4-piperidyl)sebacate,poly(N-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate;alkylated paraphenylenediamines such asN-phenyl-N′-(1,3-dimethyl-butyl)-p-phenylenediamine orN,N′-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallowamines, methyl bis tallow amine and bis tallow amine, orphenol-alpha-napththylamine or Tinuvin® 765 (Ciba), BLS® 1944 (MayzoInc) and BLS® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis(nonylphenyl amine), a dialkylamine such as(N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,preferably phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,more preferably phenyl-alpha-naphthyl amine (PANA).

In addition, the nitrogen compounds can be provided in the heat transfercomposition in an amount of from about 0.001% by weight to about 5% byweight, preferably about 0.01% by weight to about 2% by weight, morepreferably from about 0.1 to about 1% by weight. In each case,percentage by weight refers to weight of the heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant is substantially free of CO2, and astabilizer composition comprising a nitrogen compound selected fromdinitrobenzene, nitrobenzene, nitromethane, nitrosobenzene, TEMPO[(2,2,6,6-tetramethylpiperidin-1-yl)oxyl], a secondary or tertiary amineselected from diphenylamine, p-phenylenediamine, triethylamine,tributylamine, diisopropylamine, triisopropylamine and triisobutylamine;an amine antioxidant such as a substituted piperidine compound, i.e. aderivative of an alkyl substituted piperidyl, piperidinyl, piperazinone,or alkyoxypiperidinyl, selected from 2,2,6,6-tetramethyl-4-piperidone,2,2,6,6-tetramethyl-4-piperidinol;bis-(1,2,2,6,6-pentamethylpiperidyl)sebacate;di(2,2,6,6-tetramethyl-4-piperidyl)sebacate,poly(N-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate;alkylated paraphenylenediamines such asN-phenyl-N′-(1,3-dimethyl-butyl)-p-phenylenediamine orN,N′-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallowamines, methyl bis tallow amine and bis tallow amine, orphenol-alpha-napththylamine or Tinuvin® 765 (Ciba), BLS® 1944 (MayzoInc) and BLS® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis(nonylphenyl amine), a dialkylamine such as(N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,preferably phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,more preferably phenyl-alpha-naphthyl amine (PANA).

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant comprises less than 0.2% by weightof CO2, and a stabilizer composition comprising a nitrogen compoundselected from dinitrobenzene, nitrobenzene, nitromethane,nitrosobenzene, TEMPO [(2,2,6,6-tetramethylpiperidin-1-yl)oxyl], asecondary or tertiary amine selected from diphenylamine,p-phenylenediamine, triethylamine, tributylamine, diisopropylamine,triisopropylamine and triisobutylamine; an amine antioxidant such as asubstituted piperidine compound, i.e. a derivative of an alkylsubstituted piperidyl, piperidinyl, piperazinone, or alkyoxypiperidinyl,selected from 2,2,6,6-tetramethyl-4-piperidone,2,2,6,6-tetramethyl-4-piperidinol;bis-(1,2,2,6,6-pentamethylpiperidyl)sebacate;di(2,2,6,6-tetramethyl-4-piperidyl)sebacate,poly(N-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxy-piperidyl succinate;alkylated paraphenylenediamines such asN-phenyl-N′-(1,3-dimethyl-butyl)-p-phenylenediamine orN,N′-di-sec-butyl-p-phenylenediamine and hydroxylamines such as tallowamines, methyl bis tallow amine and bis tallow amine, orphenol-alpha-napththylamine or Tinuvin® 765 (Ciba), BLS® 1944 (MayzoInc) and BLS® 1770 (Mayzo Inc); an alkyldiphenyl amine such as bis(nonylphenyl amine), a dialkylamine such as(N-(1-methylethyl)-2-propylamine or phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,preferably phenyl-alpha-naphthyl amine (PANA),alkyl-phenyl-alpha-naphthyl-amine (APANA) and bis (nonylphenyl) amine,more preferably phenyl-alpha-naphthyl amine (PANA).

Alternatively or in addition, the stabilizer comprises a phenol,preferably a hindered phenol. For the purposes of this invention, thephenol can be one or more compounds selected from4,4′-methylenebis(2,6-di-tert-butylphenol);4,4′-bis(2,6-di-tert-butylphenol); 2,2- or 4,4-biphenyldiols, including4,4′-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or4,4-biphenyldiols; 2,2′-methylenebis(4-ethyl-6-tertbutylphenol);2,2′-methylenebis(4-methyl-6-tert-butylphenol);4,4-butylidenebis(3-methyl-6-tert-butylphenol);4,4-isopropylidenebis(2,6-di-tert-butylphenol);2,2′-methylenebis(4-methyl-6-nonylphenol);2,2′-isobutylidenebis(4,6-dimethylphenol);2,2′-methylenebis(4-methyl-6-cyclohexylphenol);2,6-di-tert-butyl-4-methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol:2,4-dimethyl-6-tert-butylphenol;2,6-di-tert-alpha-dimethylamino-p-cresol;2,6-di-tert-butyl-4(N,N′-dimethylaminomethylphenol);4,4′-thiobis(2-methyl-6-tert-butylphenol);4,4′-thiobis(3-methyl-6-tert-butylphenol);2,2′-thiobis(4-methyl-6-tert-butylphenol);bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone,2,2′6,6′-tetra-tert-butyl-4,4′-methylenediphenol and t-butylhydroquinone, preferably BHT

The phenol compounds can be provided in the heat transfer composition inan amount of from about 0.001% by weight to about 5% by weight,preferably about 0.01% by weight to about 2% by weight, more preferablyfrom about 0.1 to 1% by weight. In each case, percentage by weightrefers to weight of the heat transfer composition.

Alternatively, the phenol compounds can be provided in the heat transfercomposition in an amount of from about 0.001% by weight to about 5% byweight, preferably about 0.005% by weight to about 2% by weight, morepreferably from about 0.01 to 1% by weight. In each case, percentage byweight refers to weight of the heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising a phenol compound selected from4,4′-methylenebis(2,6-di-tert-butylphenol);4,4′-bis(2,6-di-tert-butylphenol); 2,2- or 4,4-biphenyldiols, including4,4′-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or4,4-biphenyldiols; 2,2′-methylenebis(4-ethyl-6-tertbutylphenol);2,2′-methylenebis(4-methyl-6-tert-butylphenol);4,4-butylidenebis(3-methyl-6-tert-butylphenol);4,4-isopropylidenebis(2,6-di-tert-butylphenol);2,2′-methylenebis(4-methyl-6-nonylphenol);2,2′-isobutylidenebis(4,6-dimethylphenol);2,2′-methylenebis(4-methyl-6-cyclohexylphenol);2,6-di-tert-butyl-4-methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol:2,4-dimethyl-6-tert-butylphenol;2,6-di-tert-alpha-dimethylamino-p-cresol;2,6-di-tert-butyl-4(N,N′-dimethylaminomethylphenol);4,4′-thiobis(2-methyl-6-tert-butylphenol);4,4′-thiobis(3-methyl-6-tert-butylphenol);2,2′-thiobis(4-methyl-6-tert-butylphenol);bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone,2,2′6,6′-tetra-tert-butyl-4,4′-methylenediphenol and t-butylhydroquinone, preferably BHT.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising a a phenol compound selected from4,4′-methylenebis(2,6-di-tert-butylphenol);4,4′-bis(2,6-di-tert-butylphenol); 2,2- or 4,4-biphenyldiols, including4,4′-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or4,4-biphenyldiols; 2,2′-methylenebis(4-ethyl-6-tertbutylphenol);2,2′-methylenebis(4-methyl-6-tert-butylphenol);4,4-butylidenebis(3-methyl-6-tert-butylphenol);4,4-isopropylidenebis(2,6-di-tert-butylphenol);2,2′-methylenebis(4-methyl-6-nonylphenol);2,2′-isobutylidenebis(4,6-dimethylphenol);2,2′-methylenebis(4-methyl-6-cyclohexylphenol);2,6-di-tert-butyl-4-methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol:2,4-dimethyl-6-tert-butylphenol;2,6-di-tert-alpha-dimethylamino-p-cresol;2,6-di-tert-butyl-4(N,N′-dimethylaminomethylphenol);4,4′-thiobis(2-methyl-6-tert-butylphenol);4,4′-thiobis(3-methyl-6-tert-butylphenol);2,2′-thiobis(4-methyl-6-tert-butylphenol);bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone,2,2′6,6′-tetra-tert-butyl-4,4′-methylenediphenol and t-butylhydroquinone, preferably BHT.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising a a phenol compound selected from4,4′-methylenebis(2,6-di-tert-butylphenol);4,4′-bis(2,6-di-tert-butylphenol); 2,2- or 4,4-biphenyldiols, including4,4′-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or4,4-biphenyldiols; 2,2′-methylenebis(4-ethyl-6-tertbutylphenol);2,2′-methylenebis(4-methyl-6-tert-butylphenol);4,4-butylidenebis(3-methyl-6-tert-butylphenol);4,4-isopropylidenebis(2,6-di-tert-butylphenol);2,2′-methylenebis(4-methyl-6-nonylphenol);2,2′-isobutylidenebis(4,6-dimethylphenol);2,2′-methylenebis(4-methyl-6-cyclohexylphenol);2,6-di-tert-butyl-4-methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol:2,4-dimethyl-6-tert-butylphenol;2,6-di-tert-alpha-dimethylamino-p-cresol;2,6-di-tert-butyl-4(N,N′-dimethylaminomethylphenol);4,4′-thiobis(2-methyl-6-tert-butylphenol);4,4′-thiobis(3-methyl-6-tert-butylphenol);2,2′-thiobis(4-methyl-6-tert-butylphenol);bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone,2,2′6,6′-tetra-tert-butyl-4,4′-methylenediphenol and t-butylhydroquinone, preferably BHT.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising a phenol compound selected from4,4′-methylenebis(2,6-di-tert-butylphenol);4,4′-bis(2,6-di-tert-butylphenol); 2,2- or 4,4-biphenyldiols, including4,4′-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or4,4-biphenyldiols; 2,2′-methylenebis(4-ethyl-6-tertbutylphenol);2,2′-methylenebis(4-methyl-6-tert-butylphenol);4,4-butylidenebis(3-methyl-6-tert-butylphenol);4,4-isopropylidenebis(2,6-di-tert-butylphenol);2,2′-methylenebis(4-methyl-6-nonylphenol);2,2′-isobutylidenebis(4,6-dimethylphenol);2,2′-methylenebis(4-methyl-6-cyclohexylphenol);2,6-di-tert-butyl-4-methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol:2,4-dimethyl-6-tert-butylphenol;2,6-di-tert-alpha-dimethylamino-p-cresol;2,6-di-tert-butyl-4(N,N′-dimethylaminomethylphenol);4,4′-thiobis(2-methyl-6-tert-butylphenol);4,4′-thiobis(3-methyl-6-tert-butylphenol);2,2′-thiobis(4-methyl-6-tert-butylphenol);bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone,2,2′6,6′-tetra-tert-butyl-4,4′-methylenediphenol and t-butylhydroquinone, preferably BHT.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising a phenol compound selected from4,4′-methylenebis(2,6-di-tert-butylphenol);4,4′-bis(2,6-di-tert-butylphenol); 2,2- or 4,4-biphenyldiols, including4,4′-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or4,4-biphenyldiols; 2,2′-methylenebis(4-ethyl-6-tertbutylphenol);2,2′-methylenebis(4-methyl-6-tert-butylphenol);4,4-butylidenebis(3-methyl-6-tert-butylphenol);4,4-isopropylidenebis(2,6-di-tert-butylphenol);2,2′-methylenebis(4-methyl-6-nonylphenol);2,2′-isobutylidenebis(4,6-dimethylphenol);2,2′-methylenebis(4-methyl-6-cyclohexylphenol);2,6-di-tert-butyl-4-methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol:2,4-dimethyl-6-tert-butylphenol;2,6-di-tert-alpha-dimethylamino-p-cresol;2,6-di-tert-butyl-4(N,N′-dimethylaminomethylphenol);4,4′-thiobis(2-methyl-6-tert-butylphenol);4,4′-thiobis(3-methyl-6-tert-butylphenol);2,2′-thiobis(4-methyl-6-tert-butylphenol);bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone,2,2′6,6′-tetra-tert-butyl-4,4′-methylenediphenol and t-butylhydroquinone, preferably BHT.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising a phenol compound selected from4,4′-methylenebis(2,6-di-tert-butylphenol);4,4′-bis(2,6-di-tert-butylphenol); 2,2- or 4,4-biphenyldiols, including4,4′-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or4,4-biphenyldiols; 2,2′-methylenebis(4-ethyl-6-tertbutylphenol);2,2′-methylenebis(4-methyl-6-tert-butylphenol);4,4-butylidenebis(3-methyl-6-tert-butylphenol);4,4-isopropylidenebis(2,6-di-tert-butylphenol);2,2′-methylenebis(4-methyl-6-nonylphenol);2,2′-isobutylidenebis(4,6-dimethylphenol);2,2′-methylenebis(4-methyl-6-cyclohexylphenol);2,6-di-tert-butyl-4-methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol:2,4-dimethyl-6-tert-butylphenol;2,6-di-tert-alpha-dimethylamino-p-cresol;2,6-di-tert-butyl-4(N,N′-dimethylaminomethylphenol);4,4′-thiobis(2-methyl-6-tert-butylphenol);4,4′-thiobis(3-methyl-6-tert-butylphenol);2,2′-thiobis(4-methyl-6-tert-butylphenol);bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone,2,2′6,6′-tetra-tert-butyl-4,4′-methylenediphenol and t-butylhydroquinone, preferably BHT.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and a stabilizer composition comprising a a phenol compoundselected from 4,4′-methylenebis(2,6-di-tert-butylphenol);4,4′-bis(2,6-di-tert-butylphenol); 2,2- or 4,4-biphenyldiols, including4,4′-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or4,4-biphenyldiols; 2,2′-methylenebis(4-ethyl-6-tertbutylphenol);2,2′-methylenebis(4-methyl-6-tert-butylphenol);4,4-butylidenebis(3-methyl-6-tert-butylphenol);4,4-isopropylidenebis(2,6-di-tert-butylphenol);2,2′-methylenebis(4-methyl-6-nonylphenol);2,2′-isobutylidenebis(4,6-dimethylphenol);2,2′-methylenebis(4-methyl-6-cyclohexylphenol);2,6-di-tert-butyl-4-methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol:2,4-dimethyl-6-tert-butylphenol;2,6-di-tert-alpha-dimethylamino-p-cresol;2,6-di-tert-butyl-4(N,N′-dimethylaminomethylphenol);4,4′-thiobis(2-methyl-6-tert-butylphenol);4,4′-thiobis(3-methyl-6-tert-butylphenol);2,2′-thiobis(4-methyl-6-tert-butylphenol);bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone,2,2′6,6′-tetra-tert-butyl-4,4′-methylenediphenol and t-butylhydroquinone, preferably BHT. In addition, the nitrogen compounds can beprovided in the heat transfer composition in an amount of from about0.001% by weight to about 5% by weight, preferably about 0.01% by weightto about 2% by weight, more preferably from about 0.1 to about 1% byweight. In each case, percentage by weight refers to weight of the heattransfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and a stabilizer composition comprising a a phenol compoundselected from 4,4′-methylenebis(2,6-di-tert-butylphenol);4,4′-bis(2,6-di-tert-butylphenol); 2,2- or 4,4-biphenyldiols, including4,4′-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or4,4-biphenyldiols; 2,2′-methylenebis(4-ethyl-6-tertbutylphenol);2,2′-methylenebis(4-methyl-6-tert-butylphenol);4,4-butylidenebis(3-methyl-6-tert-butylphenol);4,4-isopropylidenebis(2,6-di-tert-butylphenol);2,2′-methylenebis(4-methyl-6-nonylphenol);2,2′-isobutylidenebis(4,6-dimethylphenol);2,2′-methylenebis(4-methyl-6-cyclohexylphenol);2,6-di-tert-butyl-4-methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol:2,4-dimethyl-6-tert-butylphenol;2,6-di-tert-alpha-dimethylamino-p-cresol;2,6-di-tert-butyl-4(N,N′-dimethylaminomethylphenol);4,4′-thiobis(2-methyl-6-tert-butylphenol);4,4′-thiobis(3-methyl-6-tert-butylphenol);2,2′-thiobis(4-methyl-6-tert-butylphenol);bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone,2,2′6,6′-tetra-tert-butyl-4,4′-methylenediphenol and t-butylhydroquinone, preferably BHT. In addition, the heat transfer compositionof the invention comprises a refrigerant according to any one of therefrigerants described here, but preferably those refrigerantscomprising at least about 99.5% by weight of a blend of the followingfour compounds, with the following percentages being based on the totalweight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and a stabilizer composition comprising a phenol compoundselected from 4,4′-methylenebis(2,6-di-tert-butylphenol);4,4′-bis(2,6-di-tert-butylphenol); 2,2- or 4,4-biphenyldiols, including4,4′-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or4,4-biphenyldiols; 2,2′-methylenebis(4-ethyl-6-tertbutylphenol);2,2′-methylenebis(4-methyl-6-tert-butylphenol);4,4-butylidenebis(3-methyl-6-tert-butylphenol);4,4-isopropylidenebis(2,6-di-tert-butylphenol);2,2′-methylenebis(4-methyl-6-nonylphenol);2,2′-isobutylidenebis(4,6-dimethylphenol);2,2′-methylenebis(4-methyl-6-cyclohexylphenol);2,6-di-tert-butyl-4-methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol:2,4-dimethyl-6-tert-butylphenol;2,6-di-tert-alpha-dimethylamino-p-cresol;2,6-di-tert-butyl-4(N,N′-dimethylaminomethylphenol);4,4′-thiobis(2-methyl-6-tert-butylphenol);4,4′-thiobis(3-methyl-6-tert-butylphenol);2,2′-thiobis(4-methyl-6-tert-butylphenol);bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone,2,2′6,6′-tetra-tert-butyl-4,4′-methylenediphenol and t-butylhydroquinone, preferably BHT.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprising aphenol compound selected from4,4′-methylenebis(2,6-di-tert-butylphenol);4,4′-bis(2,6-di-tert-butylphenol); 2,2- or 4,4-biphenyldiols, including4,4′-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or4,4-biphenyldiols; 2,2′-methylenebis(4-ethyl-6-tertbutylphenol);2,2′-methylenebis(4-methyl-6-tert-butylphenol);4,4-butylidenebis(3-methyl-6-tert-butylphenol);4,4-isopropylidenebis(2,6-di-tert-butylphenol);2,2′-methylenebis(4-methyl-6-nonylphenol);2,2′-isobutylidenebis(4,6-dimethylphenol);2,2′-methylenebis(4-methyl-6-cyclohexylphenol);2,6-di-tert-butyl-4-methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol:2,4-dimethyl-6-tert-butylphenol;2,6-di-tert-alpha-dimethylamino-p-cresol;2,6-di-tert-butyl-4(N,N′-dimethylaminomethylphenol);4,4′-thiobis(2-methyl-6-tert-butylphenol);4,4′-thiobis(3-methyl-6-tert-butylphenol);2,2′-thiobis(4-methyl-6-tert-butylphenol);bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone,2,2′6,6′-tetra-tert-butyl-4,4′-methylenediphenol and t-butylhydroquinone, preferably BHT.

In addition, the nitrogen compounds can be provided in the heat transfercomposition in an amount of from about 0.001% by weight to about 5% byweight, preferably about 0.01% by weight to about 2% by weight, morepreferably from about 0.1 to about 1% by weight. In each case,percentage by weight refers to weight of the heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprising aa phenol compound selected from4,4′-methylenebis(2,6-di-tert-butylphenol);4,4′-bis(2,6-di-tert-butylphenol); 2,2- or 4,4-biphenyldiols, including4,4′-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or4,4-biphenyldiols; 2,2′-methylenebis(4-ethyl-6-tertbutylphenol);2,2′-methylenebis(4-methyl-6-tert-butylphenol);4,4-butylidenebis(3-methyl-6-tert-butylphenol);4,4-isopropylidenebis(2,6-di-tert-butylphenol);2,2′-methylenebis(4-methyl-6-nonylphenol);2,2′-isobutylidenebis(4,6-dimethylphenol);2,2′-methylenebis(4-methyl-6-cyclohexylphenol);2,6-di-tert-butyl-4-methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol:2,4-dimethyl-6-tert-butylphenol;2,6-di-tert-alpha-dimethylamino-p-cresol;2,6-di-tert-butyl-4(N,N′-dimethylaminomethylphenol);4,4′-thiobis(2-methyl-6-tert-butylphenol);4,4′-thiobis(3-methyl-6-tert-butylphenol);2,2′-thiobis(4-methyl-6-tert-butylphenol);bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone,2,2′6,6′-tetra-tert-butyl-4,4′-methylenediphenol and t-butylhydroquinone, preferably BHT.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises less than 0.2% by weight of CO2, and a stabilizer compositioncomprising a a phenol compound selected from4,4′-methylenebis(2,6-di-tert-butylphenol);4,4′-bis(2,6-di-tert-butylphenol); 2,2- or 4,4-biphenyldiols, including4,4′-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or4,4-biphenyldiols; 2,2′-methylenebis(4-ethyl-6-tertbutylphenol);2,2′-methylenebis(4-methyl-6-tert-butylphenol);4,4-butylidenebis(3-methyl-6-tert-butylphenol);4,4-isopropylidenebis(2,6-di-tert-butylphenol);2,2′-methylenebis(4-methyl-6-nonylphenol);2,2′-isobutylidenebis(4,6-dimethylphenol);2,2′-methylenebis(4-methyl-6-cyclohexylphenol);2,6-di-tert-butyl-4-methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol:2,4-dimethyl-6-tert-butylphenol;2,6-di-tert-alpha-dimethylamino-p-cresol;2,6-di-tert-butyl-4(N,N′-dimethylaminomethylphenol);4,4′-thiobis(2-methyl-6-tert-butylphenol);4,4′-thiobis(3-methyl-6-tert-butylphenol);2,2′-thiobis(4-methyl-6-tert-butylphenol);bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone,2,2′6,6′-tetra-tert-butyl-4,4′-methylenediphenol and t-butylhydroquinone, preferably BHT.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprising aa phenol compound selected from4,4′-methylenebis(2,6-di-tert-butylphenol);4,4′-bis(2,6-di-tert-butylphenol); 2,2- or 4,4-biphenyldiols, including4,4′-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or4,4-biphenyldiols; 2,2′-methylenebis(4-ethyl-6-tertbutylphenol);2,2′-methylenebis(4-methyl-6-tert-butylphenol);4,4-butylidenebis(3-methyl-6-tert-butylphenol);4,4-isopropylidenebis(2,6-di-tert-butylphenol);2,2′-methylenebis(4-methyl-6-nonylphenol);2,2′-isobutylidenebis(4,6-dimethylphenol);2,2′-methylenebis(4-methyl-6-cyclohexylphenol);2,6-di-tert-butyl-4-methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol:2,4-dimethyl-6-tert-butylphenol;2,6-di-tert-alpha-dimethylamino-p-cresol;2,6-di-tert-butyl-4(N,N′-dimethylaminomethylphenol);4,4′-thiobis(2-methyl-6-tert-butylphenol);4,4′-thiobis(3-methyl-6-tert-butylphenol);2,2′-thiobis(4-methyl-6-tert-butylphenol);bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone,2,2′6,6′-tetra-tert-butyl-4,4′-methylenediphenol and t-butylhydroquinone, preferably BHT.

In addition, the nitrogen compounds can be provided in the heat transfercomposition in an amount of from about 0.001% by weight to about 5% byweight, preferably about 0.01% by weight to about 2% by weight, morepreferably from about 0.1 to about 1% by weight. In each case,percentage by weight refers to weight of the heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprising aa phenol compound selected from4,4′-methylenebis(2,6-di-tert-butylphenol);4,4′-bis(2,6-di-tert-butylphenol); 2,2- or 4,4-biphenyldiols, including4,4′-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or4,4-biphenyldiols; 2,2′-methylenebis(4-ethyl-6-tertbutylphenol);2,2′-methylenebis(4-methyl-6-tert-butylphenol);4,4-butylidenebis(3-methyl-6-tert-butylphenol);4,4-isopropylidenebis(2,6-di-tert-butylphenol);2,2′-methylenebis(4-methyl-6-nonylphenol);2,2′-isobutylidenebis(4,6-dimethylphenol);2,2′-methylenebis(4-methyl-6-cyclohexylphenol);2,6-di-tert-butyl-4-methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol:2,4-dimethyl-6-tert-butylphenol;2,6-di-tert-alpha-dimethylamino-p-cresol;2,6-di-tert-butyl-4(N,N′-dimethylaminomethylphenol);4,4′-thiobis(2-methyl-6-tert-butylphenol);4,4′-thiobis(3-methyl-6-tert-butylphenol);2,2′-thiobis(4-methyl-6-tert-butylphenol);bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone,2,2′6,6′-tetra-tert-butyl-4,4′-methylenediphenol and t-butylhydroquinone, preferably BHT.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises less than 0.2% by weight of CO2, and a stabilizer compositioncomprising a a phenol compound selected from4,4′-methylenebis(2,6-di-tert-butylphenol);4,4′-bis(2,6-di-tert-butylphenol); 2,2- or 4,4-biphenyldiols, including4,4′-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or4,4-biphenyldiols; 2,2′-methylenebis(4-ethyl-6-tertbutylphenol);2,2′-methylenebis(4-methyl-6-tert-butylphenol);4,4-butylidenebis(3-methyl-6-tert-butylphenol);4,4-isopropylidenebis(2,6-di-tert-butylphenol);2,2′-methylenebis(4-methyl-6-nonylphenol);2,2′-isobutylidenebis(4,6-dimethylphenol);2,2′-methylenebis(4-methyl-6-cyclohexylphenol);2,6-di-tert-butyl-4-methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol:2,4-dimethyl-6-tert-butylphenol;2,6-di-tert-alpha-dimethylamino-p-cresol;2,6-di-tert-butyl-4(N,N′-dimethylaminomethylphenol);4,4′-thiobis(2-methyl-6-tert-butylphenol);4,4′-thiobis(3-methyl-6-tert-butylphenol);2,2′-thiobis(4-methyl-6-tert-butylphenol);bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone,2,2′6,6′-tetra-tert-butyl-4,4′-methylenediphenol and t-butylhydroquinone, preferably BHT.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant is substantially free of CO2, and astabilizer composition comprising a phenol compound selected from4,4′-methylenebis(2,6-di-tert-butylphenol);4,4′-bis(2,6-di-tert-butylphenol); 2,2- or 4,4-biphenyldiols, including4,4′-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or4,4-biphenyldiols; 2,2′-methylenebis(4-ethyl-6-tertbutylphenol);2,2′-methylenebis(4-methyl-6-tert-butylphenol);4,4-butylidenebis(3-methyl-6-tert-butylphenol);4,4-isopropylidenebis(2,6-di-tert-butylphenol);2,2′-methylenebis(4-methyl-6-nonylphenol);2,2′-isobutylidenebis(4,6-dimethylphenol);2,2′-methylenebis(4-methyl-6-cyclohexylphenol);2,6-di-tert-butyl-4-methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol:2,4-dimethyl-6-tert-butylphenol;2,6-di-tert-alpha-dimethylamino-p-cresol;2,6-di-tert-butyl-4(N,N′-dimethylaminomethylphenol);4,4′-thiobis(2-methyl-6-tert-butylphenol);4,4′-thiobis(3-methyl-6-tert-butylphenol);2,2′-thiobis(4-methyl-6-tert-butylphenol);bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone,2,2′6,6′-tetra-tert-butyl-4,4′-methylenediphenol and t-butylhydroquinone, preferably BHT.

In addition, the nitrogen compounds can be provided in the heat transfercomposition in an amount of from about 0.001% by weight to about 5% byweight, preferably about 0.01% by weight to about 2% by weight, morepreferably from about 0.1 to about 1% by weight. In each case,percentage by weight refers to weight of the heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant is substantially free of CO2, and astabilizer composition comprising a a phenol compound selected from4,4′-methylenebis(2,6-di-tert-butylphenol);4,4′-bis(2,6-di-tert-butylphenol); 2,2- or 4,4-biphenyldiols, including4,4′-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or4,4-biphenyldiols; 2,2′-methylenebis(4-ethyl-6-tertbutylphenol);2,2′-methylenebis(4-methyl-6-tert-butylphenol);4,4-butylidenebis(3-methyl-6-tert-butylphenol);4,4-isopropylidenebis(2,6-di-tert-butylphenol);2,2′-methylenebis(4-methyl-6-nonylphenol);2,2′-isobutylidenebis(4,6-dimethylphenol);2,2′-methylenebis(4-methyl-6-cyclohexylphenol);2,6-di-tert-butyl-4-methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol:2,4-dimethyl-6-tert-butylphenol;2,6-di-tert-alpha-dimethylamino-p-cresol;2,6-di-tert-butyl-4(N,N′-dimethylaminomethylphenol);4,4′-thiobis(2-methyl-6-tert-butylphenol);4,4′-thiobis(3-methyl-6-tert-butylphenol);2,2′-thiobis(4-methyl-6-tert-butylphenol);bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone,2,2′6,6′-tetra-tert-butyl-4,4′-methylenediphenol and t-butylhydroquinone, preferably BHT.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant comprises less than 0.2% by weightof CO2, and a stabilizer composition comprising a phenol compoundselected from 4,4′-methylenebis(2,6-di-tert-butylphenol);4,4′-bis(2,6-di-tert-butylphenol); 2,2- or 4,4-biphenyldiols, including4,4′-bis(2-methyl-6-tert-butylphenol); derivatives of 2,2- or4,4-biphenyldiols; 2,2′-methylenebis(4-ethyl-6-tertbutylphenol);2,2′-methylenebis(4-methyl-6-tert-butylphenol);4,4-butylidenebis(3-methyl-6-tert-butylphenol);4,4-isopropylidenebis(2,6-di-tert-butylphenol);2,2′-methylenebis(4-methyl-6-nonylphenol);2,2′-isobutylidenebis(4,6-dimethylphenol);2,2′-methylenebis(4-methyl-6-cyclohexylphenol);2,6-di-tert-butyl-4-methylphenol (BHT); 2,6-di-tert-butyl-4-ethylphenol:2,4-dimethyl-6-tert-butylphenol;2,6-di-tert-alpha-dimethylamino-p-cresol;2,6-di-tert-butyl-4(N,N′-dimethylaminomethylphenol);4,4′-thiobis(2-methyl-6-tert-butylphenol);4,4′-thiobis(3-methyl-6-tert-butylphenol);2,2′-thiobis(4-methyl-6-tert-butylphenol);bis(3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide; bis(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, tocopherol, hydroquinone,2,2′6,6′-tetra-tert-butyl-4,4′-methylenediphenol and t-butylhydroquinone, preferably BHT.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising BHT, in an amount of from about 0.001% by weightto about 5% by weight based on the weight of heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising BHT, in an amount of from about 0.001% by weightto about 5% by weight based on the weight of heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising BHT, in an amount of from about 0.001% by weightto about 5% by weight based on the weight of heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising BHT, in an amount of from about 0.001% by weightto about 5% by weight based on the weight of heat transfer composition.

In addition, the nitrogen compounds can be provided in the heat transfercomposition in an amount of from about 0.001% by weight to about 5% byweight, preferably about 0.01% by weight to about 2% by weight, morepreferably from about 0.1 to about 1% by weight. In each case,percentage by weight refers to weight of the heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising BHT, in an amount of from about 0.001% by weightto about 5% by weight based on the weight of heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising BHT, in an amount of from about 0.001% by weightto about 5% by weight based on the weight of heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and a stabilizer composition comprising BHT, in an amountof from about 0.001% by weight to about 5% by weight based on the weightof heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and a stabilizer composition comprising BHT, in an amountof from about 0.001% by weight to about 5% by weight based on the weightof heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and a stabilizer composition comprising BHT, in an amountof from about 0.001% by weight to about 5% by weight based on the weightof heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprisingBHT, in an amount of from about 0.001% by weight to about 5% by weightbased on the weight of heat transfer composition.

In addition, the nitrogen compounds can be provided in the heat transfercomposition in an amount of from about 0.001% by weight to about 5% byweight, preferably about 0.01% by weight to about 2% by weight, morepreferably from about 0.1 to about 1% by weight. In each case,percentage by weight refers to weight of the heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprisingBHT, in an amount of from about 0.001% by weight to about 5% by weightbased on the weight of heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises less than 0.2% by weight of CO2, and a stabilizer compositioncomprising BHT, in an amount of from about 0.001% by weight to about 5%by weight based on the weight of heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprisingBHT, in an amount of from about 0.001% by weight to about 5% by weightbased on the weight of heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprisingBHT, in an amount of from about 0.001% by weight to about 5% by weightbased on the weight of heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises less than 0.2% by weight of CO2, and a stabilizer compositioncomprising BHT, in an amount of from about 0.001% by weight to about 5%by weight based on the weight of heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant is substantially free of CO2, and astabilizer composition comprising BHT, in an amount of from about 0.001%by weight to about 5% by weight based on the weight of heat transfercomposition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant is substantially free of CO2, and astabilizer composition comprising BHT, in an amount of from about 0.001%by weight to about 5% by weight based on the weight of heat transfercomposition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant comprises less than 0.2% by weightof CO2, and a stabilizer composition comprising BHT, in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofheat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT, whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT, whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT, whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT, whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT, whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT, whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and a stabilizer composition comprising farnesene, diphenylphosphite and/or BHT, wherein the farnesene is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofthe heat transfer composition, the diphenyl phosphite is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of the heat transfer composition and the BHT is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and a stabilizer comprising farnesene, diphenyl phosphiteand/or BHT, wherein the farnesene is provided in an amount of from about0.001% by weight to about 5% by weight based on the weight of the heattransfer composition, the diphenyl phosphite is provided in an amount ofof from about 0.001% by weight to about 5% by weight based on the weightof the heat transfer composition and the BHT is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofheat transfer composition. In addition, the heat transfer composition ofthe invention comprises a refrigerant according to any one of therefrigerants described here, but preferably those refrigerantscomprising at least about 99.5% by weight of a blend of the followingfour compounds, with the following percentages being based on the totalweight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and a stabilizer composition comprising farnesene, diphenylphosphite and/or BHT, wherein the farnesene is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofthe heat transfer composition, the diphenyl phosphite is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of the heat transfer composition and the BHT is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprisingfarnesene, diphenyl phosphite and/or BHT, wherein the farnesene isprovided in an amount of from about 0.001% by weight to about 5% byweight based on the weight of the heat transfer composition, thediphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprisingfarnesene, diphenyl phosphite and/or BHT, wherein the farnesene isprovided in an amount of from about 0.001% by weight to about 5% byweight based on the weight of the heat transfer composition, thediphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises less than 0.2% by weight of CO2, and a stabilizer compositioncomprising farnesene, diphenyl phosphite and/or BHT, wherein thefarnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprisingfarnesene, diphenyl phosphite and/or BHT, wherein the farnesene isprovided in an amount of from about 0.001% by weight to about 5% byweight based on the weight of the heat transfer composition, thediphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprisingfarnesene, diphenyl phosphite and/or BHT, wherein the farnesene isprovided in an amount of from about 0.001% by weight to about 5% byweight based on the weight of the heat transfer composition, thediphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises less than 0.2% by weight of CO2, and a stabilizer compositioncomprising farnesene, diphenyl phosphite and/or BHT, wherein thefarnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant is substantially free of CO2, and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT, wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant is substantially free of CO2, and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT, wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant comprises less than 0.2% by weightof CO2, and a stabilizer composition comprising farnesene, diphenylphosphite and/or BHT, wherein the farnesene is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofthe heat transfer composition, the diphenyl phosphite is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of the heat transfer composition and the BHT is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition consisting essentially of farnesene, diphenyl phosphiteand/or BHT, wherein the farnesene is provided in an amount of from about0.001% by weight to about 5% by weight based on the weight of the heattransfer composition, the diphenyl phosphite is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofthe heat transfer composition and the BHT is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofheat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition consisting essentially of farnesene, diphenyl phosphiteand/or BHT, wherein the farnesene is provided in an amount of from about0.001% by weight to about 5% by weight based on the weight of the heattransfer composition, the diphenyl phosphite is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofthe heat transfer composition and the BHT is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofheat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition consisting essentially of farnesene, diphenyl phosphiteand/or BHT, wherein the farnesene is provided in an amount of from about0.001% by weight to about 5% by weight based on the weight of the heattransfer composition, the diphenyl phosphite is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofthe heat transfer composition and the BHT is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofheat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition consisting essentially of farnesene, diphenyl phosphiteand/or BHT, wherein the farnesene is provided in an amount of from about0.001% by weight to about 5% by weight based on the weight of the heattransfer composition, the diphenyl phosphite is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofthe heat transfer composition and the BHT is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofheat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition consisting essentially of farnesene, diphenyl phosphiteand/or BHT, wherein the farnesene is provided in an amount of from about0.001% by weight to about 5% by weight based on the weight of the heattransfer composition, the diphenyl phosphite is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofthe heat transfer composition and the BHT is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofheat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition consisting essentially of farnesene, diphenyl phosphiteand/or BHT, wherein the farnesene is provided in an amount of from about0.001% by weight to about 5% by weight based on the weight of the heattransfer composition, the diphenyl phosphite is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofthe heat transfer composition and the BHT is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofheat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and a stabilizer composition consisting essentially offarnesene, diphenyl phosphite and/or BHT, wherein the farnesene isprovided in an amount of from about 0.001% by weight to about 5% byweight based on the weight of the heat transfer composition, thediphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and a stabilizer consisting essentially of farnesene,diphenyl phosphite and/or BHT, wherein the farnesene is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of the heat transfer composition, the diphenyl phosphite isprovided in an amount of from about 0.001% by weight to about 5% byweight based on the weight of the heat transfer composition and the BHTis provided in an amount of from about 0.001% by weight to about 5% byweight based on the weight of heat transfer composition. In addition,the heat transfer composition of the invention comprises a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 99.5% by weight of a blendof the following four compounds, with the following percentages beingbased on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and a stabilizer composition consisting essentially offarnesene, diphenyl phosphite and/or BHT, wherein the farnesene isprovided in an amount of from about 0.001% by weight to about 5% byweight based on the weight of the heat transfer composition, thediphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition consistingessentially of farnesene, diphenyl phosphite and/or BHT, wherein thefarnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition consistingessentially of farnesene, diphenyl phosphite and/or BHT, wherein thefarnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises less than 0.2% by weight of CO2, and a stabilizer compositionconsisting essentially of farnesene, diphenyl phosphite and/or BHT,wherein the farnesene is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition consistingessentially of farnesene, diphenyl phosphite and/or BHT, wherein thefarnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition consistingessentially of farnesene, diphenyl phosphite and/or BHT, wherein thefarnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises less than 0.2% by weight of CO2, and a stabilizer compositionconsisting essentially of farnesene, diphenyl phosphite and/or BHT,wherein the farnesene is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant is substantially free of CO2, and astabilizer composition consisting essentially of farnesene, diphenylphosphite and/or BHT, wherein the farnesene is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofthe heat transfer composition, the diphenyl phosphite is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of the heat transfer composition and the BHT is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant is substantially free of CO2, and astabilizer composition consisting essentially of farnesene, diphenylphosphite and/or BHT, wherein the farnesene is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofthe heat transfer composition, the diphenyl phosphite is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of the heat transfer composition and the BHT is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of heat transfer composition.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant comprises less than 0.2% by weightof CO2, and a stabilizer composition consisting essentially offarnesene, diphenyl phosphite and/or BHT, wherein the farnesene isprovided in an amount of from about 0.001% by weight to about 5% byweight based on the weight of the heat transfer composition, thediphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition.

Each of the heat transfer compositions of the invention as defined abovemay additionally comprise a lubricant. In general, the heat transfercomposition comprises a lubricant, in amounts of from about 5% to 60% byweight of the heat transfer composition, preferably from about 10 toabout 60% by weight of the heat transfer composition, preferably formabout 20 to about 50% by weight of the heat transfer composition,alternatively about 20 to about 40% by weight of the heat transfercomposition, alternatively about 20 to about 30% by weight of the heattransfer composition, alternatively about 30 to about 50% by weight ofthe heat transfer composition, alternatively about 30 to about 40% byweight of the heat transfer composition. The heat transfer compositionmay comprise a lubricant, in amounts of from about 5 to about 10% byweight of the heat transfer composition, preferably around about 8% byweight of the heat transfer composition.

Commonly used refrigerant lubricants such as polyol esters (POEs),polyalkylene glycols (PAGs), silicone oils, mineral oil, alkylbenzenes(ABs), polyvinyl ethers (PVEs) and poly(alpha-olefin) (PAO) that areused in refrigeration machinery may be used with the refrigerantcompositions of the present invention.

Preferably the lubricants are selected from polyol esters (POEs),polyalkylene glycols (PAGs), mineral oil, alkylbenzenes (ABs) andpolyvinyl ethers (PVE), more preferably from polyol esters (POEs),mineral oil, alkylbenzenes (ABs) and polyvinyl ethers (PVE),particularly from polyol esters (POEs), mineral oil and alkylbenzenes(ABs), most preferably from polyol esters (POEs).

Commercially available mineral oils include Witco LP 250 (registeredtrademark) from Witco, Suniso 3GS from Witco and Calumet R015 fromCalumet. Commercially available alkylbenzene lubricants include Zerol150 (registered trademark) or Zerol 300 (registered trademark) fromShrieve Chemical. Commercially available esters include neopentileglycol dipelargomate which is available as Emery 2917 (registeredtrademark) and Hatcol 2370 (registered trademark). Other useful estersinclude phosphate esters, di-basic acid esters and fluoro esters.

For the purposes of this invention, the heat transfer composition cancomprise a refrigerant and a stabilizer composition as disclosed aboveand a lubricant selected from polyol esters (POEs), polyalkylene glycols(PAGs), mineral oil, alkylbenzenes (ABs) and polyvinyl ethers (PVE),more preferably from polyol esters (POEs), mineral oil, alkylbenzenes(ABs) and polyvinyl ethers (PVE), particularly from polyol esters(POEs), mineral oil and alkylbenzenes (ABs), most preferably from polyolesters (POEs).

A preferred heat transfer composition comprises a refrigerant accordingto any one of the refrigerants described here, but preferably thoserefrigerants comprising at least about 97% by weight of a blend of thefollowing four compounds, with the following percentages being based onthe total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a polyol ester (POE)lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and from about 10% toabout 60 wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and from about 10% toabout 60 wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and from about 10% toabout 60 wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and from about 10% toabout 60 wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and from about 10% toabout 60 wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and from about 10% toabout 60 wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and from about 10% to about 60 wt % of a polyol ester (POE)lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and from about 10% to about 60 wt % of a polyol ester (POE)lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and from about 10% to about 60 wt % of a polyol ester (POE)lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and from about 10% to

about 60 wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and from about 10% to about 60 wt % of apolyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises less than 0.2% by weight of CO2, and from about 10% to about60 wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and from about 10% to

about 60 wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and from about 10% to about 60 wt % of apolyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises less than 0.2% by weight of CO2, and from about 10% to about60 wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant is substantially free of CO2, andfrom about 10% to about 60 wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant is substantially free of CO2, andfrom about 10% to about 60 wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant comprises less than 0.2% by weightof CO2, and from about 10% to about 60 wt % of a polyol ester (POE)lubricant.

A preferred heat transfer composition comprises a refrigerant accordingto any one of the refrigerants described here, but preferably thoserefrigerants comprising at least about 97% by weight of a blend of thefollowing four compounds, with the following percentages being based onthe total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising BHT, in an amount of from about 0.001% by weightto about 5% by weight based on the weight of heat transfer composition,and a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising BHT, in an amount of from about 0.001% by weightto about 5% by weight based on the weight of heat transfer composition,and from about 10% to about 60 wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising BHT, in an amount of from about 0.001% by weightto about 5% by weight based on the weight of heat transfer composition,and from about 10% to about 60 wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising BHT, in an amount of from about 0.001% by weightto about 5% by weight based on the weight of heat transfer composition,and from about 10% to about 60 wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising BHT, in an amount of from about 0.001% by weightto about 5% by weight based on the weight of heat transfer composition,and from about 10% to about 60 wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising BHT, in an amount of from about 0.001% by weightto about 5% by weight based on the weight of heat transfer composition,and from about 10% to about 60 wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising BHT, in an amount of from about 0.001% by weightto about 5% by weight based on the weight of heat transfer composition,and from about 10% to about 60 wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and a stabilizer composition comprising BHT, in an amountof from about 0.001% by weight to about 5% by weight based on the weightof heat transfer composition, and from about 10% to about 60 wt % of apolyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and a stabilizer composition comprising BHT, in an amountof from about 0.001% by weight to about 5% by weight based on the weightof heat transfer composition, and from about 10% to about 60 wt % of apolyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and a stabilizer composition comprising BHT, in an amountof from about 0.001% by weight to about 5% by weight based on the weightof heat transfer composition, and from about 10% to about 60 wt % of apolyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprisingBHT, in an amount of from about 0.001% by weight to about 5% by weightbased on the weight of heat transfer composition, and from about 10% toabout 60 wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprisingBHT, in an amount of from about 0.001% by weight to about 5% by weightbased on the weight of heat transfer composition, and from about 10% toabout 60 wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises less than 0.2% by weight of CO2, and a stabilizer compositioncomprising BHT, in an amount of from about 0.001% by weight to about 5%by weight based on the weight of heat transfer composition, and fromabout 10% to about 60 wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprisingBHT, in an amount of from about 0.001% by weight to about 5% by weightbased on the weight of heat transfer composition, and from about 10% toabout 60 wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprisingBHT, in an amount of from about 0.001% by weight to about 5% by weightbased on the weight of heat transfer composition, and from about 10% toabout 60 wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises less than 0.2% by weight of CO2, and a stabilizer compositioncomprising BHT, in an amount of from about 0.001% by weight to about 5%by weight based on the weight of heat transfer composition, and fromabout 10% to about 60 wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant is substantially free of CO2, and astabilizer composition comprising BHT, in an amount of from about 0.001%by weight to about 5% by weight based on the weight of heat transfercomposition, and from about 10% to about 60 wt % of a polyol ester (POE)lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant is substantially free of CO2, and astabilizer composition comprising BHT, in an amount of from about 0.001%by weight to about 5% by weight based on the weight of heat transfercomposition, and from about 10% to about 60 wt % of a polyol ester (POE)lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant comprises less than 0.2% by weightof CO2, and a stabilizer composition comprising BHT, in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofheat transfer composition, and from about 10% to about 60 wt % of apolyol ester (POE) lubricant.

A preferred heat transfer composition comprises a refrigerant accordingto any one of the refrigerants described here, but preferably thoserefrigerants comprising at least about 97% by weight of a blend of thefollowing four compounds, with the following percentages being based onthe total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition and a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition and from about 10% to about 60 wt % of a polyol ester (POE)lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition and from about 10% to about 60 wt % of a polyol ester (POE)lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition and from about 10% to about 60 wt % of a polyol ester (POE)lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition, and from about 10% to about 60 wt % of a polyol ester (POE)lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition, and from about 10% to about 60 wt % of a polyol ester (POE)lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition, and from about 10% to about 60 wt % of a polyol ester (POE)lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and a stabilizer composition comprising farnesene, diphenylphosphite and/or BHT wherein the farnesene is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofthe heat transfer composition, the diphenyl phosphite is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of the heat transfer composition and the BHT is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of heat transfer composition, and from about 10% to about 60 wt %of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and a stabilizer composition comprising farnesene, diphenylphosphite and/or BHT wherein the farnesene is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofthe heat transfer composition, the diphenyl phosphite is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of the heat transfer composition and the BHT is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of heat transfer composition, and from about 10% to about 60 wt %of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and a stabilizer composition comprising farnesene, diphenylphosphite and/or BHT wherein the farnesene is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofthe heat transfer composition, the diphenyl phosphite is provided in anamount of of from about 0.001% by weight to about 5% by weight based onthe weight of the heat transfer composition and the BHT is provided inan amount of from about 0.001% by weight to about 5% by weight based onthe weight of heat transfer composition, and from about 10% to about 60wt % of a polyol ester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprisingfarnesene, diphenyl phosphite and/or BHT wherein the farnesene isprovided in an amount of from about 0.001% by weight to about 5% byweight based on the weight of the heat transfer composition, thediphenyl phosphite is provided in an amount of of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition, and from about 10% to about 60 wt % of a polyol ester (POE)lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprisingfarnesene, diphenyl phosphite and/or BHT wherein the farnesene isprovided in an amount of from about 0.001% by weight to about 5% byweight based on the weight of the heat transfer composition, thediphenyl phosphite is provided in an amount of of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition, and from about 10% to about 60 wt % of a polyol ester (POE)lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises less than 0.2% by weight of CO2, and a stabilizer compositioncomprising farnesene, diphenyl phosphite and/or BHT wherein thefarnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition, and from about 10% to about 60 wt % of a polyol ester (POE)lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprisingfarnesene, diphenyl phosphite and/or BHT wherein the farnesene isprovided in an amount of from about 0.001% by weight to about 5% byweight based on the weight of the heat transfer composition, thediphenyl phosphite is provided in an amount of of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition, and from about 10% to about 60 wt % of a polyol ester (POE)lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and a stabilizer composition comprisingfarnesene, diphenyl phosphite and/or BHT wherein the farnesene isprovided in an amount of from about 0.001% by weight to about 5% byweight based on the weight of the heat transfer composition, thediphenyl phosphite is provided in an amount of of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition, and from about 10% to about 60 wt % of a polyol ester (POE)lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises less than 0.2% by weight of CO2, and a stabilizer compositioncomprising farnesene, diphenyl phosphite and/or BHT wherein thefarnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition, and from about 10% to about 60 wt % of a polyol ester (POE)lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant is substantially free of CO2, and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition, and from about 10% to about 60 wt % of a polyolester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant is substantially free of CO2, and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition, and from about 10% to about 60 wt % of a polyolester (POE) lubricant.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant comprises less than 0.2% by weightof CO2, and a stabilizer composition comprising farnesene, diphenylphosphite and/or BHT wherein the farnesene is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofthe heat transfer composition, the diphenyl phosphite is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of the heat transfer composition and the BHT is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of heat transfer composition, and from about 10% to about 60 wt %of a polyol ester (POE) lubricant.

Where the compositions of the invention are provided for use in mobileair conditioning, the lubricant is a polyol ester (POE) lubricant or apolyalkylene glycol lubricant. Alternatively, when the compositions ofthe invention are provided for stationary air conditioning applications,the lubricant is preferably a polyol ester, an alkyl benzene or amineral oil, more preferably a polyol ester. The heat transfercomposition of the invention may consist essentially of or consist of arefrigerant, a stabilizer composition and a lubricant as describedherein.

It has surprisingly been discovered that the refrigerant compositions ofthe invention are miscible with POE lubricants across a desirable andwide range of temperatures, e.g. temperatures of from about −40° C. to+80° C. This allows the inventive refrigerant and heat transfercompositions to be used in a wider variety of heat transfer applicationsthan R410A. For example, the inventive refrigerant and heat transfercompositions may be used in refrigeration, air conditioning and heatpump applications.

A preferred heat transfer composition comprises a refrigerant accordingto any one of the refrigerants described here, but preferably thoserefrigerants comprising at least about 97% by weight of a blend of thefollowing four compounds, with the following percentages being based onthe total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a polyol ester (POE)lubricant; wherein the lubricant is present in an amount of 5 wt %relative to the total amount of refrigerant and lubricant and whereinthe mixture has one liquid phase at at least one temperature in therange of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and from about 10% toabout 60 wt % of a polyol ester (POE) lubricant; wherein the lubricantis present in an amount of 5 wt % relative to the total amount ofrefrigerant and lubricant and wherein the mixture has one liquid phaseat at least one temperature in the range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and from about 10% toabout 60 wt % of a polyol ester (POE) lubricant; wherein the lubricantis present in an amount of 5 wt % relative to the total amount ofrefrigerant and lubricant and wherein the mixture has one liquid phaseat at least one temperature in the range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and from about 10% toabout 60 wt % of a polyol ester (POE) lubricant; wherein the lubricantis present in an amount of 5 wt % relative to the total amount ofrefrigerant and lubricant and wherein the mixture has one liquid phaseat at least one temperature in the range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and from about 10% toabout 60 wt % of a polyol ester (POE) lubricant; wherein the lubricantis present in an amount of 5 wt % relative to the total amount ofrefrigerant and lubricant and wherein the mixture has one liquid phaseat at least one temperature in the range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and from about 10% toabout 60 wt % of a polyol ester (POE) lubricant; wherein the lubricantis present in an amount of 5 wt % relative to the total amount ofrefrigerant and lubricant and wherein the mixture has one liquid phaseat at least one temperature in the range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and from about 10% toabout 60 wt % of a polyol ester (POE) lubricant; wherein the lubricantis present in an amount of 5 wt % relative to the total amount ofrefrigerant and lubricant and wherein the mixture has one liquid phaseat at least one temperature in the range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and from about 10% to about 60 wt % of a polyol ester (POE)lubricant; wherein the lubricant is present in an amount of 5 wt %relative to the total amount of refrigerant and lubricant and whereinthe mixture has one liquid phase at at least one temperature in therange of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and from about 10% to about 60 wt % of a polyol ester (POE)lubricant; wherein the lubricant is present in an amount of 5 wt %relative to the total amount of refrigerant and lubricant and whereinthe mixture has one liquid phase at at least one temperature in therange of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and from about 10% to about 60 wt % of a polyol ester (POE)lubricant; wherein the lubricant is present in an amount of 5 wt %relative to the total amount of refrigerant and lubricant and whereinthe mixture has one liquid phase at at least one temperature in therange of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and from about 10% to

about 60 wt % of a polyol ester (POE) lubricant; wherein the lubricantis present in an amount of 5 wt % relative to the total amount ofrefrigerant and lubricant and wherein the mixture has one liquid phaseat at least one temperature in the range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and from about 10% to about 60 wt % of apolyol ester (POE) lubricant; wherein the lubricant is present in anamount of 5 wt % relative to the total amount of refrigerant andlubricant and wherein the mixture has one liquid phase at at least onetemperature in the range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises less than 0.2% by weight of CO2, and from

about 10% to about 60 wt % of a polyol ester (POE) lubricant; whereinthe lubricant is present in an amount of 5 wt % relative to the totalamount of refrigerant and lubricant and wherein the mixture has oneliquid phase at at least one temperature in the range of −40° C. to +80°C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and from about 10% to about 60 wt % of apolyol ester (POE) lubricant; wherein the lubricant is present in anamount of 5 wt % relative to the total amount of refrigerant andlubricant and wherein the mixture has one liquid phase at at least onetemperature in the range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and from about 10% to about 60 wt % of apolyol ester (POE) lubricant; wherein the lubricant is present in anamount of 5 wt % relative to the total amount of refrigerant andlubricant and wherein the mixture has one liquid phase at at least onetemperature in the range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises less than 0.2% by weight of CO2, and from

about 10% to about 60 wt % of a polyol ester (POE) lubricant; whereinthe lubricant is present in an amount of 5 wt % relative to the totalamount of refrigerant and lubricant and wherein the mixture has oneliquid phase at at least one temperature in the range of −40° C. to +80°C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant is substantially free of CO2, andfrom about 10% to about 60 wt % of a polyol ester (POE) lubricant;wherein the lubricant is present in an amount of 5 wt % relative to thetotal amount of refrigerant and lubricant and wherein the mixture hasone liquid phase at at least one temperature in the range of −40° C. to+80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant is substantially free of CO2, andfrom about 10% to about 60 wt % of a polyol ester (POE) lubricant;wherein the lubricant is present in an amount of 5 wt % relative to thetotal amount of refrigerant and lubricant and wherein the mixture hasone liquid phase at at least one temperature in the range of −40° C. to+80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant comprises less than 0.2% by weightof CO2, and from about 10% to about 60 wt % of a polyol ester (POE)lubricant; wherein the lubricant is present in an amount of 5 wt %relative to the total amount of refrigerant and lubricant and whereinthe mixture has one liquid phase at at least one temperature in therange of −40° C. to +80° C.

A preferred heat transfer composition comprises a refrigerant accordingto any one of the refrigerants described here, but preferably thoserefrigerants comprising at least about 97% by weight of a blend of thefollowing four compounds, with the following percentages being based onthe total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a polyol ester (POE)lubricant; wherein the lubricant is present in an amount of 5 wt %relative to the total amount of refrigerant and lubricant and whereinthe mixture has one liquid phase across the temperature range of −40° C.to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and from about 10% toabout 60 wt % of a polyol ester (POE) lubricant; wherein the lubricantis present in an amount of 5 wt % relative to the total amount ofrefrigerant and lubricant and wherein the mixture has one liquid phaseacross the temperature range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and from about 10% toabout 60 wt % of a polyol ester (POE) lubricant; wherein the lubricantis present in an amount of 5 wt % relative to the total amount ofrefrigerant and lubricant and wherein the mixture has one liquid phaseacross the temperature range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and from about 10% toabout 60 wt % of a polyol ester (POE) lubricant; wherein the lubricantis present in an amount of 5 wt % relative to the total amount ofrefrigerant and lubricant and wherein the mixture has one liquid phaseacross the temperature range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and from about 10% toabout 60 wt % of a polyol ester (POE) lubricant; wherein the lubricantis present in an amount of 5 wt % relative to the total amount ofrefrigerant and lubricant and wherein the mixture has one liquid phaseacross the temperature range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and from about 10% toabout 60 wt % of a polyol ester (POE) lubricant; wherein the lubricantis present in an amount of 5 wt % relative to the total amount ofrefrigerant and lubricant and wherein the mixture has one liquid phaseacross the temperature range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and from about 10% toabout 60 wt % of a polyol ester (POE) lubricant; wherein the lubricantis present in an amount of 5 wt % relative to the total amount ofrefrigerant and lubricant and wherein the mixture has one liquid phaseacross the temperature range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and from

about 10% to about 60 wt % of a polyol ester (POE) lubricant; whereinthe lubricant is present in an amount of 5 wt % relative to the totalamount of refrigerant and lubricant and wherein the mixture has oneliquid phase across the temperature range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and from

about 10% to about 60 wt % of a polyol ester (POE) lubricant; whereinthe lubricant is present in an amount of 5 wt % relative to the totalamount of refrigerant and lubricant and wherein the mixture has oneliquid phase across the temperature range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and from about 10% to about 60 wt % of a polyol ester (POE)lubricant; wherein the lubricant is present in an amount of 5 wt %relative to the total amount of refrigerant and lubricant and whereinthe mixture has one liquid phase across the temperature range of −40° C.to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and from about 10% to about 60 wt % of apolyol ester (POE) lubricant; wherein the lubricant is present in anamount of 5 wt % relative to the total amount of refrigerant andlubricant and wherein the mixture has one liquid phase across thetemperature range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and from about 10% to about 60 wt % of apolyol ester (POE) lubricant; wherein the lubricant is present in anamount of 5 wt % relative to the total amount of refrigerant andlubricant and wherein the mixture has one liquid phase across thetemperature range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises less than 0.2% by weight of CO2, and from about 10% to about60 wt % of a polyol ester (POE) lubricant; wherein the lubricant ispresent in an amount of 5 wt % relative to the total amount ofrefrigerant and lubricant and wherein the mixture has one liquid phaseacross the temperature range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and from about 10% to about 60 wt % of apolyol ester (POE) lubricant; wherein the lubricant is present in anamount of 5 wt % relative to the total amount of refrigerant andlubricant and wherein the mixture has one liquid phase across thetemperature range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantis substantially free of CO2, and from about 10% to about 60 wt % of apolyol ester (POE) lubricant; wherein the lubricant is present in anamount of 5 wt % relative to the total amount of refrigerant andlubricant and wherein the mixture has one liquid phase across thetemperature range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the refrigerantcomprises less than 0.2% by weight of CO2, and from about 10% to about60 wt % of a polyol ester (POE) lubricant; wherein the lubricant ispresent in an amount of 5 wt % relative to the total amount ofrefrigerant and lubricant and wherein the mixture has one liquid phaseacross the temperature range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant is substantially free of CO2, andfrom about 10% to about 60 wt % of a polyol ester (POE) lubricant;wherein the lubricant is present in an amount of 5 wt % relative to thetotal amount of refrigerant and lubricant and wherein the mixture hasone liquid phase across the temperature range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant is substantially free of CO2, andfrom about 10% to about 60 wt % of a polyol ester (POE) lubricant;wherein the lubricant is present in an amount of 5 wt % relative to thetotal amount of refrigerant and lubricant and wherein the mixture hasone liquid phase across the temperature range of −40° C. to +80° C.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the refrigerant comprises less than 0.2% by weightof CO2, and from about 10% to about 60 wt % of a polyol ester (POE)lubricant; wherein the lubricant is present in an amount of 5 wt %relative to the total amount of refrigerant and lubricant and whereinthe mixture has one liquid phase across the temperature range of −40° C.to +80° C.

The present invention can further comprise a heat transfer compositionas set out herein wherein the lubricant is present in an amount of 20 wt% relative to the total amount of refrigerant and lubricant and whereinthe mixture has one liquid phase across the temperature range of −40° C.to +80° C.

The present invention can further comprise a heat transfer compositionas set out herein wherein the lubricant is present in an amount of 50 wt% relative to the total amount of refrigerant and lubricant and whereinthe mixture has one liquid phase across the temperature range of −40° C.to +80° C.

In a particularly preferred feature of the present invention, the heattransfer composition comprises a refrigerant as set out herein, and aPOE lubricant, wherein the lubricant is present in an amount of 5 wt %relative to the total amount of refrigerant and lubricant and whereinthe mixture has one liquid phase at at least one temperature in therange of −40 to −25° C. and/or in the range of +50 to +80° C.

In a particularly preferred feature of the present invention, the heattransfer composition comprises a refrigerant as set out herein, and aPOE lubricant, wherein the lubricant is present in an amount of 20 wt %relative to the total amount of refrigerant and lubricant and whereinthe mixture has one liquid phase at at least one temperature in therange of −40 to −25° C. and/or in the range of +50 to +80° C.

In a particularly preferred feature of the present invention, the heattransfer composition comprises a refrigerant as set out herein, and aPOE lubricant, wherein the lubricant is present in an amount of 50 wt %relative to the total amount of refrigerant and lubricant and whereinthe mixture has one liquid phase at at least one temperature in therange of −40 to −25° C. and/or in the range of +50 to +80° C.

In an alternative particularly preferred feature of the presentinvention, the heat transfer composition comprises a refrigerant as setout herein, and a POE lubricant, wherein the lubricant is present in anamount of 5 wt % relative to the total amount of refrigerant andlubricant and wherein the mixture has one liquid phase across thetemperature range of −40 to −25° C. and/or +50 to +80° C.

In an alternative particularly preferred feature of the presentinvention, the heat transfer composition comprises a refrigerant as setout herein, and a POE lubricant, wherein the lubricant is present in anamount of 20 wt % relative to the total amount of refrigerant andlubricant and wherein the mixture has one liquid phase across thetemperature range of −40 to −25° C. and/or +50 to +80° C.

In an alternative particularly preferred feature of the presentinvention, the heat transfer composition comprises a refrigerant as setout herein, and a POE lubricant, wherein the lubricant is present in anamount of 50 wt % relative to the total amount of refrigerant andlubricant and wherein the mixture has one liquid phase across thetemperature range of −40 to −25° C. and/or +50 to +80° C.

Other additives not mentioned herein can also be included by thoseskilled in the art in view of the teaching contained herein withoutdeparting from the novel and basic features of the present invention.

Combinations of surfactants and solubilizing agents may also be added tothe present compositions to aid oil solubility as disclosed in U.S. Pat.No. 6,516,837, the disclosure of which is incorporated by reference.

The applicants have found that the compositions of the invention arecapable of achieving a difficult to achieve combination of propertiesincluding particularly low GWP. Thus, the compositions of the inventionhave a Global Warming Potential (GWP) of not greater than about 1500,preferably not greater than about 1000, more preferably not greater thanabout 750. In a particularly preferred feature of the invention, thecomposition of the invention has a Global Warming Potential (GWP) of notgreater than about 750.

In addition, the compositions of the invention have a low OzoneDepletion Potential (ODP). Thus the compositions of the invention havean Ozone Depletion Potential (ODP) of not greater than 0.05, preferablynot greater than 0.02, more preferably about zero.

In addition the compositions of the invention show acceptable toxicityand preferably have an Occupational Exposure Limit (OEL) of greater thanabout 400.

The compositions disclosed herein are provided for use in heat transferapplications, including air conditioning, refrigeration and heat pumps.

Any reference to the heat transfer composition of the invention refersto each and any of the heat transfer compositions as described herein.Thus, for the following discussion of the uses or applications of theheat transfer composition of the invention, the heat transfercomposition may comprise or consist essentially of any of therefrigerants described herein.

For the purposes of this invention, each and any of the heat transfercompositions as described herein can be used in a heat transfer system,such as an air conditioning system, a refrigeration system or a heatpump. The heat transfer system according to the present invention cancomprise a compressor, an evaporator, a condenser and an expansiondevice, in communication with each other.

Examples of commonly used compressors, for the purposes of thisinvention include reciprocating, rotary (including rolling piston androtary vane), scroll, screw, and centrifugal compressors. Thus, thepresent invention provides each and any of the refrigerants and/or heattransfer compositions as described herein for use in a heat transfersystem comprising a reciprocating, rotary (including rolling piston androtary vane), scroll, screw, or centrifugal compressor.

Examples of commonly used expansion devices, for the purposes of thisinvention include a capillary tube, a fixed orifice, a thermal expansionvalve and an electronic expansion valve. Thus, the present inventionprovides each and any of the refrigerants and/or heat transfercompositions as described herein for use in a heat transfer systemcomprising a capillary tube, a fixed orifice, a thermal expansion valveor an electronic expansion valve.

For the purposes of this invention, the evaporator and the condensertogether form a heat exchanger, preferably selected from a finned tubeheat exchanger, a microchannel heat exchanger, a shell and tube, a plateheat exchanger, and a tube-in-tube heat exchanger. Thus, the presentinvention provides each and any of the refrigerants and/or heat transfercompositions as described herein for use in a heat transfer systemwherein the evaporator and condenser together form a finned tube heatexchanger, a microchannel heat exchanger, a shell and tube, a plate heatexchanger, or a tube-in-tube heat exchanger.

The heat transfer composition of the invention can be used in heatingand cooling applications.

In a particular feature of the invention, the heat transfer compositioncan be used in a method of cooling comprising condensing a heat transfercomposition and subsequently evaporating said composition in thevicinity of an article or body to be cooled.

Thus, the invention relates to a method of cooling in a heat transfersystem comprising an evaporator, a condenser and a compressor, theprocess comprising i) condensing a heat transfer composition asdescribed herein; and

Thus, the invention relates to a method of cooling in a heat transfersystem comprising an evaporator, a condenser and a compressor, theprocess comprising i) condensing a heat transfer composition asdescribed herein; and

ii) evaporating the composition in the vicinity of body or article to becooled;

wherein the evaporator temperature of the heat transfer system is in therange of from and −40° C. to about +10° C.

Thus, the invention relates to a method of heating in a heat transfersystem comprising an evaporator, a condenser and a compressor, theprocess comprising i) condensing a heat transfer composition asdescribed herein, in the vicinity of a body or article to be heated

and

ii) evaporating the composition; wherein the evaporator temperature ofthe heat transfer system is in the range of about −30° C. to about 5° C.

Alternatively or in addition, the heat transfer composition can be usedin a method of heating comprising condensing the heat transfercomposition in the vicinity of an article or body to be heated andsubsequently evaporating said composition.

The heat transfer composition of the invention is provided for use inair conditioning applications including both mobile and stationary airconditioning applications. Thus, any of the heat transfer compositionsdescribed herein can be used in any one of:

-   -   an air conditioning application including mobile air        conditioning, particularly automobile air conditioning,    -   a mobile heat pump, particularly an electric vehicle heat pump;    -   a chiller, particularly a positive displacement chiller, more        particularly an air cooled or water cooled direct expansion        chiller, which is either modular or conventionally singularly        packaged,    -   a residential air conditioning system, particularly a ducted        split or a ductless split air conditioning system,    -   a residential heat pump,    -   a residential air to water heat pump/hydronic system,    -   an industrial air conditioning system    -   an commercial air conditioning system, particularly a packaged        rooftop unit and a variable refrigerant flow (VRF) system;    -   a commercial air source, water source or ground source heat pump        system.

The heat transfer composition of the invention is provided for use in arefrigeration system. The term “refrigeration system” refers to anysystem or apparatus or any part or portion of such a system or apparatuswhich employs a refrigerant to provide cooling. Thus, any of the heattransfer compositions described herein can be used in any one of:

-   -   a low temperature refrigeration system,    -   a medium temperature refrigeration system,    -   a commercial refrigerator,    -   a commercial freezer,    -   an ice machine,    -   a vending machine,    -   a transport refrigeration system,    -   a domestic freezer,    -   a domestic refrigerator,    -   an industrial freezer,    -   an industrial refrigerator and    -   a chiller.

Each of the heat transfer compositions described herein is particularlyprovided for use in a residential air-conditioning system (with anevaporator temperature in the range of about 0 to about 10° C.,particularly about 7° C. for cooling and/or in the range of about −20 toabout 3° C., particularly about 0.5° C. for heating).). Alternatively oradditionally, each of the heat transfer compositions described herein isparticularly provided for use in a residential air conditioning systemwith a reciprocating, rotary (rolling-piston or rotary vane) or scrollcompressor.

Each of the heat transfer compositions described herein is particularlyprovided for use in an air cooled chiller (with an evaporatortemperature in the range of about 0 to about 10° C., particularly about4.5° C.), particularly an air cooled chiller with a positivedisplacement compressor, more particular an air cooled chiller with areciprocating scroll compressor.

Each of the heat transfer compositions described herein is particularlyprovided for use in a residential air to water heat pump hydronic system(with an evaporator temperature in the range of about −20 to about 3°C., particularly about 0.5° C. or with an evaporator temperature in therange of about −30 to about 5° C., particularly about 0.5° C.).

Each of the heat transfer compositions described herein is particularlyprovided for use in a medium temperature refrigeration system (with anevaporator temperature in the range of about −12 to about 0° C.,particularly about −8° C.).

Each of the heat transfer compositions described herein is particularlyprovided for use in a low temperature refrigeration system (with anevaporator temperature in the range of about −40 to about −12° C.,particularly about −32° C.).

Thus, the heat transfer composition of the invention is provided for usein a residential air conditioning system, wherein the residentialair-conditioning system is used to supply cool air (said air having atemperature of for example, about 10° C. to about 17° C., particularlyabout 12° C.) to buildings for example, in the summer. Typical systemtypes are split, mini-split, and window, ducted split, ductless split,window, and portable air-conditioning system. The system usually has anair-to-refrigerant evaporator (indoor coil), a compressor, an air-to-refrigerant condenser (outdoor coil), and an expansion valve. Theevaporator and condenser are usually a round tube plate fin, a finnedtube or microchannel heat exchanger. The compressor is usually areciprocating or rotary (rolling-piston or rotary vane) or scrollcompressor. The expansion valve is usually a capillary tube, thermal orelectronic expansion valve. The refrigerant evaporating temperature ispreferably in the range of 0 to 10° C. The condensing temperature ispreferably in the range of 40 to 70° C.

The heat transfer composition of the invention is provided for use in aresidential heat pump system, wherein the residential heat pump systemis used to supply warm air (said air having a temperature of forexample, about 18° C. to about 24° C., particularly about 21° C.) tobuildings in the winter. It is usually the same system as theresidential air-conditioning system, while in the heat pump mode therefrigerant flow is reversed and the indoor coil becomes condenser andthe outdoor coil becomes evaporator. Typical system types are split andmini-split heat pump system. The evaporator and condenser are usually around tube plate fin, a finned or microchannel heat exchanger. Thecompressor is usually a reciprocating or rotary (rolling-piston orrotary vane) or scroll compressor. The expansion valve is usually athermal or electronic expansion valve. The refrigerant evaporatingtemperature is preferably in the range of about −20 to about 3° C. orabout −30 to about 5° C. The condensing temperature is preferably in therange of about 35 to about 50° C.

The heat transfer composition of the invention is provided for use in acommercial air-conditioning system wherein the commercial airconditioning system can be a chiller which is used to supply chilledwater (said water having a temperature of for example about 7° C.) tolarge buildings such as offices and hospitals, etc. Depending on theapplication, the chiller system may be running all year long. Thechiller system may be air-cooled or water-cooled. The air-cooled chillerusually has a plate, tube-in-tube or shell-and-tube evaporator to supplychilled water, a reciprocating or scroll compressor, a round tube platefin, a finned tube or microchannel condenser to exchange heat withambient air, and a thermal or electronic expansion valve. Thewater-cooled system usually has a shell-and-tube evaporator to supplychilled water, a reciprocating, scroll, screw or centrifugal compressor,a shell-and-tube condenser to exchange heat with water from coolingtower or lake, sea and other natural recourses, and a thermal orelectronic expansion valve. The refrigerant evaporating temperature ispreferably in the range of about 0 to about 10° C. The condensingtemperature is preferably in the range of about 40 to about 70° C.

The heat transfer composition of the invention is provided for use in aresidential air-to-water heat pump hydronic system, wherein theresidential air-to-water heat pump hydronic system is used to supply hotwater (said water having a temperature of for example about 50° C. orabout 55° C.) to buildings for floor heating or similar applications inthe winter. The hydronic system usually has a round tube plate fin, afinned tube or microchannel evaporator to exchange heat with ambientair, a reciprocating, scroll or rotary compressor, a plate, tube-in-tubeor shell-in-tube condenser to heat the water, and a thermal orelectronic expansion valve. The refrigerant evaporating temperature ispreferably in the range of about −20 to about 3° C., or 30 to about 5°C. The condensing temperature is preferably in the range of about 50 toabout 90° C.

The heat transfer composition of the invention is provided for use in amedium temperature refrigeration system, wherein the medium temperaturerefrigeration system is preferably used to chill food or beverages suchas in a refrigerator or a bottle cooler. The system usually has anair-to-refrigerant evaporator to chill the food or beverage, areciprocating, scroll or screw or rotary compressor, anair-to-refrigerant condenser to exchange heat with the ambient air, anda thermal or electronic expansion valve. The refrigerant evaporatingtemperature is preferably in the range of about −12 to about 0° C. Thecondensing temperature is preferably in the range of about 40 to about70° C., or about 20 to about 70° C.

The heat transfer composition of the invention is provided for use in alow temperature refrigeration system, wherein said low temperaturerefrigeration system is preferably used in a freezer or an ice creammachine. The system usually has an air-to-refrigerant evaporator tochill the food or beverage, a reciprocating, scroll or rotarycompressor, an air-to-refrigerant condenser to exchange heat with theambient air, and a thermal or electronic expansion valve. Therefrigerant evaporating temperature is preferably in the range of about−40 to about −12° C. The condensing temperature is preferably in therange of about 40 to about 70° C., or about 20 to about 70° C.

A preferred heat transfer composition comprises a refrigerant accordingto any one of the refrigerants described here, but preferably thoserefrigerants comprising at least about 97% by weight of a blend of thefollowing four compounds, with the following percentages being based onthe total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; in achiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; in achiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; in achiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; in achiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; in achiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans

HFO-1234ze wherein the percentages are based on the total weight of thefour compounds in the blend; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; in achiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant comprises less than 0.2% by weight of CO2; in achiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant comprises less than 0.2% by weight of CO2; in achiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend and wherein the refrigerant issubstantially free of CO2; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend and wherein the refrigerant issubstantially free of CO2; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (trans HFO-1234zewherein the percentages are based on the total weight of the fourcompounds in the blend and wherein the refrigerant is substantially freeof CO2; in a chiller.

A preferred heat transfer composition comprises a refrigerant accordingto any one of the refrigerants described here, but preferably thoserefrigerants comprising at least about 97% by weight of a blend of thefollowing four compounds, with the following percentages being based onthe total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend, andfrom 10 to 60 wt. % of a polyol ester (POE) lubricant based on theweight of the heat transfer composition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend, andfrom 10 to 60 wt. % of a polyol ester (POE) lubricant based on theweight of the heat transfer composition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend, andfrom 10 to 60 wt. % of a polyol ester (POE) lubricant based on theweight of the heat transfer composition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend, andfrom 10 to 60 wt. % of a polyol ester (POE) lubricant based on theweight of the heat transfer composition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend, andfrom 10 to 60 wt. % of a polyol ester (POE) lubricant based on theweight of the heat transfer composition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze wherein the percentages arebased on the total weight of the four compounds in the blend, and from10 to 60 wt. % of a polyol ester (POE) lubricant based on the weight ofthe heat transfer composition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend, andfrom 10 to 60 wt. % of a polyol ester (POE) lubricant based on theweight of the heat transfer composition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend, and from 10 to 60 wt. % of a polyolester (POE) lubricant based on the weight of the heat transfercomposition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend, and from 10 to 60 wt. % of a polyolester (POE) lubricant based on the weight of the heat transfercomposition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend, and from 10 to 60 wt. % of a polyolester (POE) lubricant based on the weight of the heat transfercomposition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2, and from 10 to 60wt. % of a polyol ester (POE) lubricant based on the weight of the heattransfer composition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2, and from 10 to 60wt. % of a polyol ester (POE) lubricant based on the weight of the heattransfer composition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant comprises less than 0.2% by weight of CO2, andfrom 10 to 60 wt. % of a polyol ester (POE) lubricant based on theweight of the heat transfer composition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2, and from 10 to 60wt. % of a polyol ester (POE) lubricant based on the weight of the heattransfer composition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2, and from 10 to 60wt. % of a polyol ester (POE) lubricant based on the weight of the heattransfer composition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant comprises less than 0.2% by weight of CO2, andfrom 10 to 60 wt. % of a polyol ester (POE) lubricant based on theweight of the heat transfer composition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend and wherein the refrigerant issubstantially free of CO2, and from 10 to 60 wt. % of a polyol ester(POE) lubricant based on the weight of the heat transfer composition; ina chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend and wherein the refrigerant issubstantially free of CO2, and from 10 to 60 wt. % of a polyol ester(POE) lubricant based on the weight of the heat transfer composition; ina chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (trans HFO-1234zewherein the percentages are based on the total weight of the fourcompounds in the blend and wherein the refrigerant is substantially freeof CO2, and from 10 to 60 wt. % of a polyol ester (POE) lubricant basedon the weight of the heat transfer composition; in a chiller.

A preferred heat transfer composition comprises a refrigerant accordingto any one of the refrigerants described here, but preferably thoserefrigerants comprising at least about 97% by weight of a blend of thefollowing four compounds, with the following percentages being based onthe total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze wherein the percentages arebased on the total weight of the four compounds in the blend; and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend; and a stabilizer composition comprisingfarnesene, diphenyl phosphite and/or BHT wherein the farnesene isprovided in an amount of from about 0.001% by weight to about 5% byweight based on the weight of the heat transfer composition, thediphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend; and a stabilizer composition comprisingfarnesene, diphenyl phosphite and/or BHT wherein the farnesene isprovided in an amount of from about 0.001% by weight to about 5% byweight based on the weight of the heat transfer composition, thediphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend; and a stabilizer composition comprisingfarnesene, diphenyl phosphite and/or BHT wherein the farnesene isprovided in an amount of from about 0.001% by weight to about 5% byweight based on the weight of the heat transfer composition, thediphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2; and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2 and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant comprises less than 0.2% by weight of CO2 and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2 and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2 and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant comprises less than 0.2% by weight of CO2 and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend and wherein the refrigerant issubstantially free of CO2 and a stabilizer composition comprisingfarnesene, diphenyl phosphite and/or BHT wherein the farnesene isprovided in an amount of from about 0.001% by weight to about 5% byweight based on the weight of the heat transfer composition, thediphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend and wherein the refrigerant issubstantially free of CO2 and a stabilizer composition comprisingfarnesene, diphenyl phosphite and/or BHT wherein the farnesene isprovided in an amount of from about 0.001% by weight to about 5% byweight based on the weight of the heat transfer composition, thediphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition; in a chiller.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (trans HFO-1234zewherein the percentages are based on the total weight of the fourcompounds in the blend and wherein the refrigerant is substantially freeof CO2 and a stabilizer composition comprising farnesene, diphenylphosphite and/or BHT wherein the farnesene is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofthe heat transfer composition, the diphenyl phosphite is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of the heat transfer composition and the BHT is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of heat transfer composition; in a chiller.

For the purposes of this invention, the heat transfer composition as setout above is provided for use in a chiller with an evaporatingtemperature in the range of about 0 to about 100° C. and a condensingtemperature in the range of about 40 to about 70° C. The chiller isprovided for use in air conditioning or refrigeration, preferably forrefrigeration. The chiller is preferably a positive displacementchiller, more particularly an air cooled or water cooled directexpansion chiller, which is either modular or conventionally singularlypackaged.

A preferred heat transfer composition comprises a refrigerant accordingto any one of the refrigerants described here, but preferably thoserefrigerants comprising at least about 97% by weight of a blend of thefollowing four compounds, with the following percentages being based onthe total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; instationary air conditioning, particularly residential air conditioning,industrial air conditioning or commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; instationary air conditioning, particularly residential air conditioning,industrial air conditioning or commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; instationary air conditioning, particularly residential air conditioning,industrial air conditioning or commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; instationary air conditioning, particularly residential air conditioning,industrial air conditioning or commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; instationary air conditioning, particularly residential air conditioning,industrial air conditioning or commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze wherein the percentages arebased on the total weight of the four compounds in the blend;) instationary air conditioning, particularly residential air conditioning,industrial air conditioning or commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; instationary air conditioning, particularly residential air conditioning,industrial air conditioning or commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend; in stationary air conditioning,particularly residential air conditioning, industrial air conditioningor commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend; in stationary air conditioning,particularly residential air conditioning, industrial air conditioningor commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend; in stationary air conditioning,particularly residential air conditioning, industrial air conditioningor commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2; in stationary airconditioning, particularly residential air conditioning, industrial airconditioning or commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2; in stationary airconditioning, particularly residential air conditioning, industrial airconditioning or commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant comprises less than 0.2% by weight of CO2; instationary air conditioning, particularly residential air conditioning,industrial air conditioning or commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2; in stationary airconditioning, particularly residential air conditioning, industrial airconditioning or commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2; in stationary airconditioning, particularly residential air conditioning, industrial airconditioning or commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant comprises less than 0.2% by weight of CO2; instationary air conditioning, particularly residential air conditioning,industrial air conditioning or commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend and wherein the refrigerant issubstantially free of CO2; in stationary air conditioning, particularlyresidential air conditioning, industrial air conditioning or commercialair conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend and wherein the refrigerant issubstantially free of CO2; in stationary air conditioning, particularlyresidential air conditioning, industrial air conditioning or commercialair conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (trans HFO-1234zewherein the percentages are based on the total weight of the fourcompounds in the blend and wherein the refrigerant is substantially freeof CO2; in stationary air conditioning, particularly residential airconditioning, industrial air conditioning or commercial airconditioning.

A preferred heat transfer composition comprises a refrigerant accordingto any one of the refrigerants described here, but preferably thoserefrigerants comprising at least about 97% by weight of a blend of thefollowing four compounds, with the following percentages being based onthe total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; andfrom 10 to 60 wt % of a polyol ester (POE) lubricant; in stationary airconditioning, particularly residential air conditioning, industrial airconditioning or commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; andfrom 10 to 60 wt % of a polyol ester (POE) lubricant; in stationary airconditioning, particularly residential air conditioning, industrial airconditioning or commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; andfrom 10 to 60 wt % of a polyol ester (POE) lubricant; in stationary airconditioning, particularly residential air conditioning, industrial airconditioning or commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; andfrom 10 to 60 wt % of a polyol ester (POE) lubricant; in stationary airconditioning, particularly residential air conditioning, industrial airconditioning or commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; andfrom 10 to 60 wt % of a polyol ester (POE) lubricant; in stationary airconditioning, particularly residential air conditioning, industrial airconditioning or commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze wherein the percentages arebased on the total weight of the four compounds in the blend; and from10 to 60 wt % of a polyol ester (POE) lubricant; in stationary airconditioning, particularly residential air conditioning, industrial airconditioning or commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; andfrom 10 to 60 wt % of a polyol ester (POE) lubricant; in stationary airconditioning, particularly residential air conditioning, industrial airconditioning or commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend; and from 10 to 60 wt % of a polyolester (POE) lubricant; in stationary air conditioning, particularlyresidential air conditioning, industrial air conditioning or commercialair conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend; and from 10 to 60 wt % of a polyolester (POE) lubricant; in stationary air conditioning, particularlyresidential air conditioning, industrial air conditioning or commercialair conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend; and from 10 to 60 wt % of a polyolester (POE) lubricant; in stationary air conditioning, particularlyresidential air conditioning, industrial air conditioning or commercialair conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2; and from 10 to 60wt % of a polyol ester (POE) lubricant; in stationary air conditioning,particularly residential air conditioning, industrial air conditioningor commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2 and from 10 to 60wt % of a polyol ester (POE) lubricant; in stationary air conditioning,particularly residential air conditioning, industrial air conditioningor commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant comprises less than 0.2% by weight of CO2 andfrom 10 to 60 wt % of a polyol ester (POE) lubricant; in stationary airconditioning, particularly residential air conditioning, industrial airconditioning or commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2 and from 10 to 60wt % of a polyol ester (POE) lubricant; in stationary air conditioning,particularly residential air conditioning, industrial air conditioningor commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2; and from 10 to 60wt % of a polyol ester (POE) lubricant; in stationary air conditioning,particularly residential air conditioning, industrial air conditioningor commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant comprises less than 0.2% by weight of CO2 andfrom 10 to 60 wt % of a polyol ester (POE) lubricant; in stationary airconditioning, particularly residential air conditioning, industrial airconditioning or commercial air conditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend and wherein the refrigerant issubstantially free of CO2 and from 10 to 60 wt % of a polyol ester (POE)lubricant; in stationary air conditioning, particularly residential airconditioning, industrial air conditioning or commercial airconditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend and wherein the refrigerant issubstantially free of CO2 and from 10 to 60 wt % of a polyol ester (POE)lubricant; in stationary air conditioning, particularly residential airconditioning, industrial air conditioning or commercial airconditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (trans HFO-1234zewherein the percentages are based on the total weight of the fourcompounds in the blend and wherein the refrigerant is substantially freeof CO2, and from 10 to 60 wt % of a polyol ester (POE) lubricant; instationary air conditioning, particularly residential air conditioning,industrial air conditioning or commercial air conditioning.

A preferred heat transfer composition comprises a refrigerant accordingto any one of the refrigerants described here, but preferably thoserefrigerants comprising at least about 97% by weight of a blend of thefollowing four compounds, with the following percentages being based onthe total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition; and from 10 to 60 wt % of a polyol ester (POE)lubricant; in stationary air conditioning, particularly residential airconditioning, industrial air conditioning or commercial airconditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition; and from 10 to 60 wt % of a polyol ester (POE)lubricant; in stationary air conditioning, particularly residential airconditioning, industrial air conditioning or commercial airconditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition; and from 10 to 60 wt % of a polyol ester (POE)lubricant; in stationary air conditioning, particularly residential airconditioning, industrial air conditioning or commercial airconditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition; and from 10 to 60 wt % of a polyol ester (POE)lubricant; in stationary air conditioning, particularly residential airconditioning, industrial air conditioning or commercial airconditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition; and from 10 to 60 wt % of a polyol ester (POE)lubricant; in stationary air conditioning, particularly residential airconditioning, industrial air conditioning or commercial airconditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze wherein the percentages arebased on the total weight of the four compounds in the blend; and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition; and from 10 to 60 wt % of a polyol ester (POE)lubricant; in stationary air conditioning, particularly residential airconditioning, industrial air conditioning or commercial airconditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition; and from 10 to 60 wt % of a polyol ester (POE)lubricant; in stationary air conditioning, particularly residential airconditioning, industrial air conditioning or commercial airconditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend; and a stabilizer composition comprisingfarnesene, diphenyl phosphite and/or BHT wherein the farnesene isprovided in an amount of from about 0.001% by weight to about 5% byweight based on the weight of the heat transfer composition, thediphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition; and from 10 to 60 wt % of a polyol ester (POE) lubricant;in stationary air conditioning, particularly residential airconditioning, industrial air conditioning or commercial airconditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend; and a stabilizer composition comprisingfarnesene, diphenyl phosphite and/or BHT wherein the farnesene isprovided in an amount of from about 0.001% by weight to about 5% byweight based on the weight of the heat transfer composition, thediphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition; and from 10 to 60 wt % of a polyol ester (POE) lubricant;in stationary air conditioning, particularly residential airconditioning, industrial air conditioning or commercial airconditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend; and a stabilizer composition comprisingfarnesene, diphenyl phosphite and/or BHT wherein the farnesene isprovided in an amount of from about 0.001% by weight to about 5% byweight based on the weight of the heat transfer composition, thediphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition; and from 10 to 60 wt % of a polyol ester (POE) lubricant;in stationary air conditioning, particularly residential airconditioning, industrial air conditioning or commercial airconditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2; and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition; and from 10 to 60 wt % of a polyol ester (POE) lubricant;in stationary air conditioning, particularly residential airconditioning, industrial air conditioning or commercial airconditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2 and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition; and from 10 to 60 wt % of a polyol ester (POE) lubricant;in stationary air conditioning, particularly residential airconditioning, industrial air conditioning or commercial airconditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant comprises less than 0.2% by weight of CO2 and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition; and from 10 to 60 wt % of a polyol ester (POE)lubricant; in stationary air conditioning, particularly residential airconditioning, industrial air conditioning or commercial airconditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2 and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition; and from 10 to 60 wt % of a polyol ester (POE) lubricant;in stationary air conditioning, particularly residential airconditioning, industrial air conditioning or commercial airconditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2 and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition; and from 10 to 60 wt % of a polyol ester (POE) lubricant;in stationary air conditioning, particularly residential airconditioning, industrial air conditioning or commercial airconditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant comprises less than 0.2% by weight of CO2 and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition; and from 10 to 60 wt % of a polyol ester (POE)lubricant; in stationary air conditioning, particularly residential airconditioning, industrial air conditioning or commercial airconditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend and wherein the refrigerant issubstantially free of CO2 and a stabilizer composition comprisingfarnesene, diphenyl phosphite and/or BHT wherein the farnesene isprovided in an amount of from about 0.001% by weight to about 5% byweight based on the weight of the heat transfer composition, thediphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition; and from 10 to 60 wt % of a polyol ester (POE) lubricant;in stationary air conditioning, particularly residential airconditioning, industrial air conditioning or commercial airconditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend and wherein the refrigerant issubstantially free of CO2 and a stabilizer composition comprisingfarnesene, diphenyl phosphite and/or BHT wherein the farnesene isprovided in an amount of from about 0.001% by weight to about 5% byweight based on the weight of the heat transfer composition, thediphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition; and from 10 to 60 wt % of a polyol ester (POE) lubricant;in stationary air conditioning, particularly residential airconditioning, industrial air conditioning or commercial airconditioning.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (trans HFO-1234zewherein the percentages are based on the total weight of the fourcompounds in the blend and wherein the refrigerant is substantially freeof CO2 and a stabilizer composition comprising farnesene, diphenylphosphite and/or BHT wherein the farnesene is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofthe heat transfer composition, the diphenyl phosphite is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of the heat transfer composition and the BHT is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of heat transfer composition; and from 10 to 60 wt % of a polyolester (POE) lubricant; in stationary air conditioning, particularlyresidential air conditioning, industrial air conditioning or commercialair conditioning.

A preferred heat transfer composition comprises a refrigerant accordingto any one of the refrigerants described here, but preferably thoserefrigerants comprising at least about 97% by weight of a blend of thefollowing four compounds, with the following percentages being based onthe total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; incommercial refrigeration, particularly in a commercial refrigerator,commercial freezer, an ice machine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; incommercial refrigeration, particularly in a commercial refrigerator,commercial freezer, an ice machine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; incommercial refrigeration, particularly in a commercial refrigerator,commercial freezer, an ice machine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; incommercial refrigeration, particularly in a commercial refrigerator,commercial freezer, an ice machine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; incommercial refrigeration, particularly in a commercial refrigerator,commercial freezer, an ice machine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze wherein the percentages arebased on the total weight of the four compounds in the blend; incommercial refrigeration, particularly in a commercial refrigerator,commercial freezer, an ice machine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; incommercial refrigeration, particularly in a commercial refrigerator,commercial freezer, an ice machine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend; in commercial refrigeration,particularly in a commercial refrigerator, commercial freezer, an icemachine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend; in commercial refrigeration,particularly in a commercial refrigerator, commercial freezer, an icemachine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend; in commercial refrigeration,particularly in a commercial refrigerator, commercial freezer, an icemachine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2; in commercialrefrigeration, particularly in a commercial refrigerator, commercialfreezer, an ice machine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2; in commercialrefrigeration, particularly in a commercial refrigerator, commercialfreezer, an ice machine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant comprises less than 0.2% by weight of CO2; incommercial refrigeration, particularly in a commercial refrigerator,commercial freezer, an ice machine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2; in commercialrefrigeration, particularly in a commercial refrigerator, commercialfreezer, an ice machine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2; in commercialrefrigeration, particularly in a commercial refrigerator, commercialfreezer, an ice machine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant comprises less than 0.2% by weight of CO2; incommercial refrigeration, particularly in a commercial refrigerator,commercial freezer, an ice machine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend and wherein the refrigerant issubstantially free of CO2; in commercial refrigeration, particularly ina commercial refrigerator, commercial freezer, an ice machine or avending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend and wherein the refrigerant issubstantially free of CO2; in commercial refrigeration, particularly ina commercial refrigerator, commercial freezer, an ice machine or avending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (trans HFO-1234zewherein the percentages are based on the total weight of the fourcompounds in the blend and wherein the refrigerant is substantially freeof CO2; in commercial refrigeration, particularly in a commercialrefrigerator, commercial freezer, an ice machine or a vending machine.

A preferred heat transfer composition comprises a refrigerant accordingto any one of the refrigerants described here, but preferably thoserefrigerants comprising at least about 97% by weight of a blend of thefollowing four compounds, with the following percentages being based onthe total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend; incommercial refrigeration, particularly in a commercial refrigerator,commercial freezer, an ice machine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend, andfrom 10 to 60 wt. % of a polyol ester (POE) lubricant based on theweight of the heat transfer composition; in commercial refrigeration,particularly in a commercial refrigerator, commercial freezer, an icemachine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend, andfrom 10 to 60 wt. % of a polyol ester (POE) lubricant based on theweight of the heat transfer composition; in commercial refrigeration,particularly in a commercial refrigerator, commercial freezer, an icemachine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andfrom 10 to 60 wt. % of a polyol ester (POE) lubricant based on theweight of the heat transfer composition; in commercial refrigeration,particularly in a commercial refrigerator, commercial freezer, an icemachine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend, andfrom 10 to 60 wt. % of a polyol ester (POE) lubricant based on theweight of the heat transfer composition; in commercial refrigeration,particularly in a commercial refrigerator, commercial freezer, an icemachine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze wherein the percentages arebased on the total weight of the four compounds in the blend, and from10 to 60 wt. % of a polyol ester (POE) lubricant based on the weight ofthe heat transfer composition; in commercial refrigeration, particularlyin a commercial refrigerator, commercial freezer, an ice machine or avending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andfrom 10 to 60 wt. % of a polyol ester (POE) lubricant based on theweight of the heat transfer composition; in commercial refrigeration,particularly in a commercial refrigerator, commercial freezer, an icemachine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend and from 10 to 60 wt. % of a polyolester (POE) lubricant based on the weight of the heat transfercomposition; in commercial refrigeration, particularly in a commercialrefrigerator, commercial freezer, an ice machine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend, and from 10 to 60 wt. % of a polyolester (POE) lubricant based on the weight of the heat transfercomposition; in commercial refrigeration, particularly in a commercialrefrigerator, commercial freezer, an ice machine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend and from 10 to 60 wt. % of a polyolester (POE) lubricant based on the weight of the heat transfercomposition; in commercial refrigeration, particularly in a commercialrefrigerator, commercial freezer, an ice machine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2, and from 10 to 60wt. % of a polyol ester (POE) lubricant based on the weight of the heattransfer composition; in commercial refrigeration, particularly in acommercial refrigerator, commercial freezer, an ice machine or a vendingmachine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2, and from 10 to 60wt. % of a polyol ester (POE) lubricant based on the weight of the heattransfer composition; in commercial refrigeration, particularly in acommercial refrigerator, commercial freezer, an ice machine or a vendingmachine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant comprises less than 0.2% by weight of CO2, andfrom 10 to 60 wt. % of a polyol ester (POE) lubricant based on theweight of the heat transfer composition; in commercial refrigeration,particularly in a commercial refrigerator, commercial freezer, an icemachine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2 and from 10 to 60wt. % of a polyol ester (POE) lubricant based on the weight of the heattransfer composition; in commercial refrigeration, particularly in acommercial refrigerator, commercial freezer, an ice machine or a vendingmachine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant is substantially free of CO2 and from 10 to 60wt. % of a polyol ester (POE) lubricant based on the weight of the heattransfer composition; in commercial refrigeration, particularly in acommercial refrigerator, commercial freezer, an ice machine or a vendingmachine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentagesare based on the total weight of the four compounds in the blend andwherein the refrigerant comprises less than 0.2% by weight of CO2 andfrom 10 to 60 wt. % of a polyol ester (POE) lubricant based on theweight of the heat transfer composition; in commercial refrigeration,particularly in a commercial refrigerator, commercial freezer, an icemachine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 97% by weight ofa blend of the following four compounds, with the following percentagesbeing based on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend and wherein the refrigerant issubstantially free of CO2 and from 10 to 60 wt. % of a polyol ester(POE) lubricant based on the weight of the heat transfer composition; incommercial refrigeration, particularly in a commercial refrigerator,commercial freezer, an ice machine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 98.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), wherein the percentages are based on the total weight ofthe four compounds in the blend and wherein the refrigerant issubstantially free of CO2 and from 10 to 60 wt. % of a polyol ester(POE) lubricant based on the weight of the heat transfer composition; incommercial refrigeration, particularly in a commercial refrigerator,commercial freezer, an ice machine or a vending machine.

In addition, the heat transfer composition of the invention comprises arefrigerant according to any one of the refrigerants described here, butpreferably those refrigerants comprising at least about 99.5% by weightof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (trans HFO-1234zewherein the percentages are based on the total weight of the fourcompounds in the blend and wherein the refrigerant is substantially freeof CO2 and from 10 to 60 wt. % of a polyol ester (POE) lubricant basedon the weight of the heat transfer composition; in commercialrefrigeration, particularly in a commercial refrigerator, commercialfreezer, an ice machine or a vending machine.

The heat transfer composition disclosed herein is provided as a lowGlobal Warming (GWP) replacement for the refrigerant R-410A. The heattransfer composition therefore can be used in a method of retrofittingan existing heat transfer system designed to contain or containingR-410A refrigerant, without requiring substantial engineeringmodification of the existing system, particularly without modificationof the condenser, the evaporator and/or the expansion valve.

There is therefore provided a method of retrofitting an existing heattransfer system designed to contain or containing R-410A refrigerant orwhich is suitable for use with R-410A refrigerant, said methodcomprising replacing at least a portion of the existing R-410Arefrigerant with a heat transfer composition of a refrigerant of thepresent invention.

Alternatively, the heat transfer composition can be used in a method ofretrofitting an existing heat transfer system designed to contain orcontaining R410A refrigerant, wherein the system is modified for therefrigerant of the invention.

Alternatively, the heat transfer composition can be used in a heattransfer system which is suitable for use with R410A refrigerant.

As set out above, the method comprises removing at least a portion ofthe existing R-410A refrigerant from the system. Preferably, the methodcomprises removing at least about 5%, about 10%, about 25%, about 50% orabout 75% by weight of the R-410A from the system and replacing it withthe heat transfer composition of the invention.

The compositions of the invention may be employed in systems which areused or are suitable for use with R-410A refrigerant, such as existingor new heat transfer systems.

The compositions of the present invention exhibit many of the desirablecharacteristics of R-410A but have a GWP that is substantially lowerthan that of R-410A while at the same time having operatingcharacteristics i.e. capacity and/or efficiency (COP) that aresubstantially similar to or substantially match, and preferably are ashigh as or higher than R-410A. This allows the claimed compositions toreplace R410A in existing heat transfer systems without requiring anysignificant system modification for example of the condenser, theevaporator and/or the expansion valve. The composition can therefore beused as a direct replacement in retrofitting heat exchange systems whichhave been used with or are suitable for use with R410A.

The composition of the invention therefore preferably exhibit operatingcharacteristics compared with R410A wherein:

-   -   the efficiency (COP) of the composition is from 95 to 105% of        the efficiency of R410A; and/or    -   the capacity is from 95 to 105% of the capacity of R410A.

in heat transfer systems, in which the compositions of the invention areto replace the R410A refrigerant.

The term “COP” is a measure of energy efficiency and means the ratio ofrefrigeration or cooling capacity to the energy requirement of therefrigeration system, i.e. the energy to run the compressor, fans, etc.COP is the useful output of the refrigeration system, in this case therefrigeration capacity or how much cooling is provided, divided by howpower it takes to get this output. Essentially, it is a measure of theefficiency of the system.

The term “capacity” is the amount of cooling provided, in BTUs/hr, bythe refrigerant in the refrigeration system. This is experimentallydetermined by multiplying the change in enthalpy in BTU/lb, of therefrigerant as it passes through the evaporator by the mass flow rate ofthe refrigerant. The enthalpy can be determined from the measurement ofthe pressure and temperature of the refrigerant. The capacity of therefrigeration system relates to the ability to maintain an area to becooled at a specific temperature.

The term “mass flow rate” is the amount “in pounds” of refrigerantpassing through a conduit of a given size in a given amount of time.

In order to maintain reliability of the heat transfer system, it ispreferred that the composition of the invention further exhibits thefollowing characteristics compared with R-410A:

-   -   the discharge temperature is not greater than 10° C. higher than        that of R-410A; and/or    -   the compressor pressure ratio is from 95 to 105% of the        compressor pressure ratio of R-410A

in heat transfer systems, in which the composition of the invention isused to replace the R-410A refrigerant.

It will be appreciated that R410A is an azeotrope-like composition.Thus, in order for the claimed compositions to be a good match for theoperating characteristics of R410A, the claimed compositions desirablyshow a low level of glide. Thus, the compositions of the claimedinvention may provide an evaporator glide of less than 2° C., preferablyless than 1.5° C.

The existing heat transfer compositions used with R-410A are preferablyair conditioning heat transfer systems including both mobile andstationary air conditioning systems. Thus, each of the heat transfercompositions as described herein can be used to replace R-410A in anyone of:

an air conditioning system including a mobile air conditioning system,particularly an automobile air conditioning system,

a mobile heat pump, particularly an electric vehicle heat pump;

a chiller, particularly a positive displacement chiller, moreparticularly an air cooled or water cooled direct expansion chiller,which is either modular or conventionally singularly packaged,

a residential air conditioning system, particularly a ducted split or aductless split air conditioning system,

a residential heat pump,

a residential air to water heat pump/hydronic system,

an industrial air conditioning system and

an commercial air conditioning system particularly a packaged rooftopunit and a variable refrigerant flow (VRF) system;

a commercial air source, water source or ground source heat pump system.

The composition of the invention is alternatively provided to replaceR410A in refrigeration systems. Thus, each of the heat transfercompositions as described herein can be used to replace R410A in any oneof:

-   -   a low temperature refrigeration system,    -   a medium temperature refrigeration system,    -   a commercial refrigerator,    -   a commercial freezer,    -   an ice machine,    -   a vending machine,    -   a transport refrigeration system,    -   a domestic freezer,    -   a domestic refrigerator,    -   an industrial freezer,    -   an industrial refrigerator and    -   a chiller.

Each of the heat transfer compositions described herein is particularlyprovided to replace R-410A in a residential air-conditioning system(with an evaporator temperature in the range of about 0 to about 10° C.,particularly about 7° C. for cooling and/or in the range of about −20 toabout 3° C. or 30 to about 5° C., particularly about 0.5° C. forheating). Alternatively or additionally, each of the heat transfercompositions described herein is particularly provided to replace R-410Ain a residential air conditioning system with a reciprocating, rotary(rolling-piston or rotary vane) or scroll compressor. Each of the heattransfer compositions described herein is particularly provided toreplace R410A in an air cooled chiller (with an evaporator temperaturein the range of about 0 to about 10° C., particularly about 4.5° C.),particularly an air cooled chiller with a positive displacementcompressor, more particular an air cooled chiller with a reciprocatingscroll compressor.

Each of the heat transfer compositions described herein is particularlyprovided to replace R410A in a residential air to water heat pumphydronic system (with an evaporator temperature in the range of about−20 to about 3° C., or about −30 to about 5° C. particularly about 0.5°C.).

Each of the heat transfer compositions described herein is particularlyprovided to replace R410A in a medium temperature refrigeration system(with an evaporator temperature in the range of about −12 to about 0°C., particularly about −8° C.).

Each of the heat transfer compositions described herein is particularlyprovided to replace R410A in a low temperature refrigeration system(with an evaporator temperature in the range of about −40 to about −12°C., particularly about −32° C.).

There is therefore provided a method of retrofitting an existing heattransfer system designed to contain or containing R-410A refrigerant orwhich is suitable for use with R-410A refrigerant, said methodcomprising replacing at least a portion of the existing R-410Arefrigerant with a heat transfer composition comprising a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 97% by weight of a blend ofthe following four compounds, with the following percentages being basedon the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and optionally astabilizer composition comprising farnesene, diphenyl phosphite and BHTwherein the farnesene is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition.

There is therefore provided a method of retrofitting an existing heattransfer system designed to contain or containing R-410A refrigerant orwhich is suitable for use with R-410A refrigerant, said methodcomprising replacing at least a portion of the existing R-410Arefrigerant with a heat transfer composition comprising a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 97% by weight of a blend ofthe following four compounds, with the following percentages being basedon the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and optionally astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition.

There is therefore provided a method of retrofitting an existing heattransfer system designed to contain or containing R-410A refrigerant orwhich is suitable for use with R-410A refrigerant, said methodcomprising replacing at least a portion of the existing R-410Arefrigerant with a heat transfer composition comprising a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 98.5% by weight of a blendof the following four compounds, with the following percentages beingbased on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and from about 10% toabout 60 wt % of a polyol ester (POE) lubricant; and optionally astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition.

There is therefore provided a method of retrofitting an existing heattransfer system designed to contain or containing R-410A refrigerant orwhich is suitable for use with R-410A refrigerant, said methodcomprising replacing at least a portion of the existing R-410Arefrigerant with a heat transfer composition comprising a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 99.5% by weight of a blendof the following four compounds, with the following percentages beingbased on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and optionally astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition.

The invention further provides a heat transfer system comprising acompressor, a condenser and an evaporator in fluid communication, and aheat transfer composition in said system, said heat transfer compositioncomprising comprises a refrigerant according to any one of therefrigerants described here, but preferably those refrigerantscomprising at least about 97% by weight of a blend of the following fourcompounds, with the following percentages being based on the totalweight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze, wherein the percentages are based on the total weight of thefour compounds in the blend and a stabilizer composition comprisingfarnesene, diphenyl phosphite and/or BHT wherein the farnesene isprovided in an amount of from about 0.001% by weight to about 5% byweight based on the weight of the heat transfer composition, thediphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition and from 10 to 60 wt % of a polyol ester (POE) lubricant,

said condenser having an operating temperature of from +20° C. to +70°C. and said evaporator having an operating temperature of from −40° C.to +10° C.

The invention further provides a heat transfer system comprising acompressor, a condenser and an evaporator in fluid communication, and aheat transfer composition in said system, said heat transfer compositioncomprising a refrigerant according to any one of the refrigerantsdescribed here, but preferably those refrigerants comprising at leastabout 98.5% by weight of a blend of the following four compounds, withthe following percentages being based on the total weight of thefollowing four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze, and a stabilizer composition comprising farnesene, diphenylphosphite and/or BHT wherein the farnesene is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofthe heat transfer composition, the diphenyl phosphite is provided in anamount of of from about 0.001% by weight to about 5% by weight based onthe weight of the heat transfer composition and the BHT is provided inan amount of from about 0.001% by weight to about 5% by weight based onthe weight of heat transfer composition and from 10 to 60 wt % of apolyol ester (POE) lubricant,

said condenser having an operating temperature of from +20° C. to +70°C. and said evaporator having an operating temperature of from −40° C.to +10° C.

The invention further provides a heat transfer system comprising acompressor, a condenser and an evaporator in fluid communication, and aheat transfer composition in said system, said heat transfer compositioncomprising at least about 99.5% by weight of a blend of the followingfour compounds, with the following percentages being based on the totalweight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition and from 10 to 60 wt % of a polyol ester (POE) lubricant,

said condenser having an operating temperature of from +20° C. to +70°C. and said evaporator having an operating temperature of from −40° C.to +10° C.

The invention further provides a heat transfer system comprising acompressor, a condenser and an evaporator in fluid communication, and aheat transfer composition in said system, said heat transfer compositioncomprising at least about 99.5% by weight of a blend of the followingfour compounds, with the following percentages being based on the totalweight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition and from 10 to 60 wt % of a polyol ester (POE) lubricant,

said condenser having an operating temperature of from +20° C. to +70°C. and said evaporator having an operating temperature of from −40° C.to +10° C.

The invention further provides a heat transfer system comprising acompressor, a condenser and an evaporator in fluid communication, and aheat transfer composition in said system, said heat transfer compositioncomprising a refrigerant according to any one of the refrigerantsdescribed here, but preferably those refrigerants consisting essentiallyof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and a stabilizer composition comprising farnesene, diphenylphosphite and/or BHT wherein the farnesene is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofthe heat transfer composition, the diphenyl phosphite is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of the heat transfer composition and the BHT is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of heat transfer composition and from 10 to 60 wt % of a polyolester (POE) lubricant, said condenser having an operating temperature offrom +20° C. to +70° C. and said evaporator having an operatingtemperature of from −40° C. to +10° C.

The invention further provides a heat transfer system comprising acompressor, a condenser and an evaporator in fluid communication, and aheat transfer composition in said system, said heat transfer compositioncomprising a refrigerant according to any one of the refrigerantsdescribed here, but preferably those refrigerants consisting of a blendof the following four compounds, with the following percentages beingbased on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), and a stabilizer composition comprising farnesene, diphenylphosphite and/or BHT wherein the farnesene is provided in an amount offrom about 0.001% by weight to about 5% by weight based on the weight ofthe heat transfer composition, the diphenyl phosphite is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of the heat transfer composition and the BHT is provided in anamount of from about 0.001% by weight to about 5% by weight based on theweight of heat transfer composition and from 10 to 60 wt % of a polyolester (POE) lubricant, said condenser having an operating temperature offrom +20° C. to +70° C. and said evaporator having an operatingtemperature of from −40° C. to +10° C.

There is therefore provided a method of retrofitting an existing heattransfer system designed to contain or containing R-410A refrigerant orwhich is suitable for use with R-410A refrigerant, said methodcomprising replacing at least a portion of the existing R-410Arefrigerant with a heat transfer composition comprising a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants consisting essentially of at least about 97% byweight of a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), said refrigerant beingsubstantially free of CO2, and optionally a stabilizer compositioncomprising farnesene, diphenyl phosphite and/or BHT wherein thefarnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition.

There is therefore provided a method of retrofitting an existing heattransfer system designed to contain or containing R-410A refrigerant orwhich is suitable for use with R-410A refrigerant, said methodcomprising replacing at least a portion of the existing R-410Arefrigerant with a heat transfer composition comprising a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 97% by weight of a blend ofthe following four compounds, with the following percentages being basedon the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), said refrigerant beingsubstantially free of CO2, and optionally a stabilizer compositioncomprising farnesene, diphenyl phosphite and/or BHT wherein thefarnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition.

There is therefore provided a method of retrofitting an existing heattransfer system designed to contain or containing R-410A refrigerant orwhich is suitable for use with R-410A refrigerant, said methodcomprising replacing at least a portion of the existing R-410Arefrigerant with a heat transfer composition comprising a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 98.5% by weight of a blendof the following four compounds, with the following percentages beingbased on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), said refrigerant beingsubstantially free of CO2, and from about 10% to about 60 wt % of apolyol ester (POE) lubricant; and optionally a stabilizer compositioncomprising farnesene, diphenyl phosphite and/or BHT wherein thefarnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition.

There is therefore provided a method of retrofitting an existing heattransfer system designed to contain or containing R-410A refrigerant orwhich is suitable for use with R-410A refrigerant, said methodcomprising replacing at least a portion of the existing R-410Arefrigerant with a heat transfer composition comprising a refrigerantaccording to any one of the refrigerants described here, but preferablythose refrigerants comprising at least about 99.5% by weight of a blendof the following four compounds, with the following percentages beingbased on the total weight of the following four compounds:

from about 40% by weight to about 49% by weight difluoromethane(HFC-32),

from about 6% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 33% by weight to about 40% by weight trifluoroiodomethane(CF₃I); and

from about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), said refrigerantcomprising not more than 2% by weigh of CO2, and optionally a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition.

The invention further provides a heat transfer system comprising acompressor, a condenser and an evaporator in fluid communication, and aheat transfer composition in said system, said heat transfer compositioncomprising comprises a refrigerant according to any one of therefrigerants described here, but preferably those refrigerantscomprising at least about 97% by weight of a blend of the following fourcompounds, with the following percentages being based on the totalweight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze, said refrigerant being substantially free of CO2, and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition and from 10 to 60 wt % of a polyol ester (POE)lubricant,

said condenser having an operating temperature of from +20° C. to +70°C. and said evaporator having an operating temperature of from −40° C.to +10° C.

The invention further provides a heat transfer system comprising acompressor, a condenser and an evaporator in fluid communication, and aheat transfer composition in said system, said heat transfer compositioncomprising a refrigerant according to any one of the refrigerantsdescribed here, but preferably those refrigerants comprising at leastabout 98.5% by weight of a blend of the following four compounds, withthe following percentages being based on the total weight of thefollowing four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze, said refrigerant being substantially free of CO2, and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition and from 10 to 60 wt % of a polyol ester (POE)lubricant,

said condenser having an operating temperature of from +20° C. to +70°C. and said evaporator having an operating temperature of from −40° C.to +10° C.

The invention further provides a heat transfer system comprising acompressor, a condenser and an evaporator in fluid communication, and aheat transfer composition in said system, said heat transfer compositioncomprising a refrigerant according to any one of the refrigerantsdescribed here, but preferably those refrigerants comprising at leastabout 99.5% by weight of a blend of the following four compounds, withthe following percentages being based on the total weight of thefollowing four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), said refrigerantcomprising not more than 2% by weigh of CO2, and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition and from 10 to 60 wt % of a polyol ester (POE) lubricant,

said condenser having an operating temperature of from +20° C. to +70°C. and said evaporator having an operating temperature of from −40° C.to +10° C.

The invention further provides a heat transfer system comprising acompressor, a condenser and an evaporator in fluid communication, and aheat transfer composition in said system, said heat transfer compositioncomprising at least about 99.5% by weight of a blend of the followingfour compounds, with the following percentages being based on the totalweight of the following four compounds:

from about 46.5% by weight to about 48.5% by weight difluoromethane(HFC-32),

from about 10.5% by weight to about 12% by weight pentafluoroethane(HFC-125),

from about 34.5% by weight to about 36.5% by weight trifluoroiodomethane(CF3I); and

from about 2% by weight to about 5% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), said refrigerantcomprising not more than 2% by weigh of CO2, and a stabilizercomposition comprising farnesene, diphenyl phosphite and/or BHT whereinthe farnesene is provided in an amount of from about 0.001% by weight toabout 5% by weight based on the weight of the heat transfer composition,the diphenyl phosphite is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of the heat transfercomposition and the BHT is provided in an amount of from about 0.001% byweight to about 5% by weight based on the weight of heat transfercomposition and from 10 to 60 wt % of a polyol ester (POE) lubricant,

said condenser having an operating temperature of from +20° C. to +70°C. and said evaporator having an operating temperature of from −40° C.to +10° C.

The invention further provides a heat transfer system comprising acompressor, a condenser and an evaporator in fluid communication, and aheat transfer composition in said system, said heat transfer compositioncomprising a refrigerant according to any one of the refrigerantsdescribed here, but preferably those refrigerants consisting essentiallyof a blend of the following four compounds, with the followingpercentages being based on the total weight of the following fourcompounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), said refrigerant being substantially free of CO2, and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition and from 10 to 60 wt % of a polyol ester (POE)lubricant, said condenser having an operating temperature of from +20°C. to +70° C. and said evaporator having an operating temperature offrom −40° C. to +10° C.

The invention further provides a heat transfer system comprising acompressor, a condenser and an evaporator in fluid communication, and aheat transfer composition in said system, said heat transfer compositioncomprising a refrigerant according to any one of the refrigerantsdescribed here, but preferably those refrigerants consisting of a blendof the following four compounds, with the following percentages beingbased on the total weight of the following four compounds:

about 47.5% by weight difluoromethane (HFC-32),

about 12% by weight pentafluoroethane (HFC-125),

about 36.5% by weight trifluoroiodomethane (CF₃I); and

about 4% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze), said refrigerant being substantially free of CO2, and astabilizer composition comprising farnesene, diphenyl phosphite and/orBHT wherein the farnesene is provided in an amount of from about 0.001%by weight to about 5% by weight based on the weight of the heat transfercomposition, the diphenyl phosphite is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of theheat transfer composition and the BHT is provided in an amount of fromabout 0.001% by weight to about 5% by weight based on the weight of heattransfer composition and from 10 to 60 wt % of a polyol ester (POE)lubricant, said condenser having an operating temperature of from +20°C. to +70° C. and said evaporator having an operating temperature offrom −40° C. to +10° C.

The heat transfer system is preferably an air conditioning system suchas a mobile air conditioning system, particularly an automobile airconditioning system, a mobile heat pump, particularly an electricvehicle heat pump, a chiller, particularly a positive displacementchiller, more particularly an air-cooled or water-cooled directexpansion chiller, which can be modular or conventionally singularlypackaged, a residential air conditioning system, particularly a ductedsplit and a ductless split air conditioning system, a residential heatpump, a residential air to water heat pump/hydronic system, anindustrial air conditioning systems, a commercial air conditioningsystem particularly a packaged rooftop and a variable refrigerant flow(VRF) system and a commercial air-source, water-source or ground-sourceheat pump system.

Particularly, the heat transfer system is a residential air-conditioningsystem (with an evaporator temperature in the range of about 0 to about10° C., particularly about 7° C. for cooling and/or in the range ofabout −20 to about 3° C. or about −30 to about 5° C., particularly about0.5° C. for heating).

Particularly, the heat transfer system is an air cooled chiller (with anevaporator temperature in the range of about 0 to about 10° C.,particularly about 4.5° C.), particularly an air cooled chiller with apositive displacement compressor, more particular an air cooled chillerwith a reciprocating or scroll compressor.

Particularly, the heat transfer system is a residential air to waterheat pump hydronic system (with an evaporator temperature in the rangeof about −20 to about 3° C. or about −30 to about 5° C., particularlyabout 0.5° C.).

The heat transfer system can be a refrigeration system, such as a lowtemperature refrigeration system, a medium temperature refrigerationsystem, a commercial refrigerator, a commercial freezer, an ice machine,a vending machine, a transport refrigeration system, a domestic freezer,a domestic refrigerator, an industrial freezer, an industrialrefrigerator and a chiller.

Particularly, the heat transfer system is a medium temperaturerefrigeration system (with an evaporator temperature in the range ofabout −12 to about 0° C., particularly about −8° C.).

Particularly, the heat transfer system is a low temperaturerefrigeration system (with an evaporator temperature in the range ofabout −40 to about −12° C., particularly about −32° C.).

The ability of the refrigerant compositions of this invention to matchthe operating conditions of R-410A is illustrated by the followingnon-limiting examples:

EXAMPLES

The following refrigerant compositions were evaluated for theirperformance in a number of refrigeration systems.

Each composition was subjected to thermodynamic analysis to determineits ability to match the operating characteristics of R-410A in variousrefrigeration systems. The analysis was performed using experimentaldata collected for properties of the binary pairs. The vapour liquidequilibrium behavior of CF₃I was studied in a series of binary pairswith HFC-32, HFC-125 and trans HFO-1234ze. The composition was variedover from 0% to 100% for each binary pair in the experimentalevaluation. Mixture parameters for each binary pair were regressed tothe experimentally obtained data and the parameters were alsoincorporated into the National Institute of Science and Technology(NIST) Reference Fluid Thermodynamic and Transport Properties Database(Refprop 9.1 NIST Std Database, 2013). The standard mixing parametersalready available in Refprop 9.1 were used for other binary pairs. Theassumptions used to conduct the analysis are the following: Samecompressor displacement for all refrigerants, same operating conditionsfor all refrigerants, same compressor isentropic and volumetricefficiency for all refrigerants.

TABLE 1 Refrigerants evaluated for Performance Examples R32 R125 CF3IR1234ze Refrigerant (wt %) (wt %) (wt %) (wt %) 1 47.5% 12% 36.5% 4%

TABLE 2 Properties of Refrigerant 1 Capacity COP Evap (% of (% of GlideRefrigerant GWP R410A) R410A) (° C.) Flammability OEL 1 741 95% 102%1.88 Non 537 Flammable

Example 1 Residential Air-Conditioning System (Cooling)

Description:

Residential air-conditioning systems are used to supply cool air (about12° C.) to buildings in the summer. Typical system types are split,mini-split, and window air-conditioning system. The system usually hasan air-to-refrigerant evaporator (indoor coil), a compressor, anair-to-refrigerant condenser (outdoor coil), and an expansion valve. Theevaporator and condenser is usually round tube plate fin or microchannelheat exchanger. The compressor is usually reciprocating or rotary(rolling-piston or scroll) compressor. The expansion valve is usuallythermal or electronic expansion valve. The refrigerant evaporatingtemperature is in the range of about 0 to about 10° C., while thecondensing temperature is in the range of about 40 to about 70° C.

Operating Conditions:

-   -   1. Condensing temperature=46° C., Corresponding outdoor ambient        temperature=35° C.    -   2. Condenser sub-cooling=5.5° C.    -   3. Evaporating temperature=7° C., Corresponding indoor ambient        temperature=26.7° C.    -   4. Evaporator Superheat=5.5° C.    -   5. Isentropic Efficiency=70%    -   6. Volumetric Efficiency=100%    -   7. Temperature Rise in Suction Line=5.5° C.

TABLE 3 Performance in Residential Air-Conditioning System (Cooling)Discharge Discharge Pressure Pressure Temperature Evaporator RefrigerantCapacity Efficiency ratio [kPa] Difference [° C.] Glide [° C.] R410A100% 100% 100% 100% 0 0.08 1  95% 102% 100%  92% 7.1 1.88

-   -   -   Table 3 shows the thermodynamic performance of a residential            air-conditioning system compared to R410A system.        -   Composition 1 shows 95% or higher capacity (considering ±2%            uncertainty) and matched efficiency compared to R410A. This            indicates the system performance is similar to R410A.        -   Composition 1 shows 99% pressure ratio compared to R410A.            This indicates the compressor efficiencies are similar to            R410A, and no changes on R410A compressor are needed.        -   Composition 1 shows discharge temperature rise within 10° C.            compared to R410A. This indicates good compressor            reliability and there is no risk of oil breakdown or motor            burn-out.        -   Composition 1 shows evaporator glide less than 2° C. This            indicates the evaporator glide does not affect system            performance.

Example 2 Residential Heat Pump System (Heating)

Description:

Residential heat pump systems are used to supply warm air (about 21° C.)to buildings in the winter. It is usually the same system as theresidential air-conditioning system, however, when the system is in theheat pump mode the refrigerant flow is reversed and the indoor coilbecomes condenser and the outdoor coil becomes evaporator. Typicalsystem types are split and mini-split heat pump system. The evaporatorand condenser is usually round tube plate fin or microchannel heatexchanger. The compressor is usually reciprocating or rotary(rolling-piston or scroll) compressor. The expansion valve is usuallythermal or electronic expansion valve. The refrigerant evaporatingtemperature is in the range of about −20 to about 3° C., while thecondensing temperature is in the range of about 35 to about 50° C.

Operating Conditions:

-   -   1. Condensing temperature=41° C., Corresponding indoor ambient        temperature=21.1° C.    -   2. Condenser sub-cooling=5.5° C.    -   3. Evaporating temperature=0.5° C., Corresponding outdoor        ambient temperature=8.3° C.    -   4. Evaporator Superheat=5.5° C.    -   5. Isentropic Efficiency=70%    -   6. Volumetric Efficiency=100%    -   7. Temperature Rise in Suction Line=5.5° C.

TABLE 4 Performance in Residential Heat pump System (Heating) DischargeDischarge Heating Heating Pressure Pressure Temperature EvaporatorRefrigerant Capacity Efficiency ratio [kPa] Difference [° C.] Glide [°C.] R410A 100% 100% 100% 100% 0 0.08 1  94% 102% 100%  92% 7.6 1.87

-   -   -   Table 4 shows the thermodynamic performance of a residential            heat pump system compared to R410A system.        -   Composition 1 shows 95% capacity (considering ±2%            uncertainty) and matched efficiency compared to R410A. This            indicates the system performance is similar to R410A.        -   Composition 1 shows 99% pressure ratio compared to R410A.            This indicates the compressor efficiencies are similar to            R410A, and no changes on R410A compressor are needed.        -   Composition 1 shows show discharge temperature rise within            10° C. compared to R410A. This indicates good compressor            reliability and there is no risk of oil breakdown or motor            burn-out.        -   Composition 1 shows evaporator glide less than 2° C. This            indicates the evaporator glide does not affect system            performance.

Example 3 Commercial Air-Conditioning System—Chiller

Description:

Commercial air-conditioning systems (chillers) are used to supplychilled water (about 7° C.) to large buildings such as offices,hospitals, etc. Depending on the application, the chiller system may berunning all year long. The chiller system may be air-cooled orwater-cooled. The air-cooled chiller usually has a plate orshell-and-tube evaporator to supply chilled water, a reciprocating orscroll compressor, a round tube plate fin or microchannel condenser toexchange heat with ambient air, and a thermal or electronic expansionvalve. The water-cooled system usually has a shell-and-tube evaporatorto supply chilled water, a reciprocating or scroll compressor, ashell-and-tube condenser to exchange heat with water from cooling toweror lake, sea and other natural recourses, and a thermal or electronicexpansion valve. The refrigerant evaporating temperature is in the rangeof about 0 to about 10° C., while the condensing temperature is in therange of about 40 to about 70° C.

Operating Conditions:

-   -   1. Condensing temperature=46° C., Corresponding outdoor ambient        temperature=35° C.    -   2. Condenser sub-cooling=5.5° C.    -   3. Evaporating temperature=4.5° C., Corresponding chilled        leaving water temperature=7° C.    -   4. Evaporator Superheat=5.5° C.    -   5. Isentropic Efficiency=70%    -   6. Volumetric Efficiency=100%    -   7. Temperature Rise in Suction Line=2° C.

TABLE 5 Performance in Commercial Air-Conditioning System—Air-CooledChiller Discharge Discharge Pressure Pressure Temperature EvaporatorRefrigerant Capacity Efficiency ratio [kPa] Difference [° C.] Glide [°C.] R410A 100% 100% 100% 100% 0 0.08 1  95% 102% 100%  92% 7.4 1.86

-   -   -   Table 5 shows the thermodynamic performance of a commercial            air-cooled chiller system compared to R410A system.        -   Composition 1 shows 95% or higher capacity (considering ±2%            uncertainty) and matched efficiency compared to R410A. This            indicates the system performance is similar to R410A.        -   Composition 1 shows 99% pressure ratio compared to R410A.            This indicates the compressor efficiencies are similar to            R410A, and no changes on R410A compressor are needed.        -   Composition 1 shows discharge temperature rise within 10° C.            compared to R410A. This indicates good compressor            reliability and there is no risk of oil breakdown or motor            burn-out.        -   Composition 1 shows evaporator glide less than 2° C. This            indicates the evaporator glide does not affect system            performance.

Example 4 Residential Air-to-Water Heat Pump Hydronic System

Description:

Residential air-to-water heat pump hydronic systems are used to supplyhot water (about 50° C.) to buildings for floor heating or similarapplications in the winter. The hydronic system usually has a round tubeplate fin or microchannel evaporator to exchange heat with ambient air,a reciprocating or rotary compressor, a plate condenser to heat thewater, and a thermal or electronic expansion valve. The refrigerantevaporating temperature is in the range of about −20 to about 3° C.,while the condensing temperature is in the range of about 50 to about90° C.

Operating Conditions:

-   -   1. Condensing temperature=60° C., Corresponding indoor leaving        water temperature=50° C.    -   2. Condenser sub-cooling=5.5° C.    -   3. Evaporating temperature=0.5° C., Corresponding outdoor        ambient temperature=8.3° C.    -   4. Evaporator Superheat=5.5° C.    -   5. Isentropic Efficiency=70%    -   6. Volumetric Efficiency=100%    -   7. Temperature Rise in Suction Line=2° C.

TABLE 6 Performance in Residential Air-to-Water Heat Pump HydronicSystem Discharge Discharge Heating Heating Pressure Pressure TemperatureEvaporator Refrigerant Capacity Efficiency ratio [kPa] Difference [° C.]Glide [° C.] R410A 100% 100% 100% 100% 0 0.06 1  97% 103%  99%  92% 10.31.68

-   -   -   Table 6 shows the thermodynamic performance of a residential            air-to-water heat pump hydronic system compared to R410A            system.        -   Composition 1 shows 95% or higher capacity and matched            efficiency compared to R410A. This indicates the system            performance is similar to R410A.        -   Composition 1 shows 98%-99% pressure ratio compared to            R410A. This indicates the compressor efficiencies are            similar to R410A, and no changes on R410A compressor are            needed.        -   Composition 1 shows discharge temperature rise close to            10° C. compared to R410A. This indicates good compressor            reliability and there is no risk of oil breakdown or motor            burn-out.        -   Composition 1 shows evaporator glide less than 2° C. This            indicates the evaporator glide does not affect system            performance.

Example 5 Medium Temperature Refrigeration System

Description:

Medium temperature refrigeration systems are used to chill food orbeverage such as in a refrigerator and bottle cooler. The system usuallyhas an air-to-refrigerant evaporator to chill the food or beverage, areciprocating or rotary compressor, an air-to-refrigerant condenser toexchange heat with the ambient air, and a thermal or electronicexpansion valve. The refrigerant evaporating temperature is in the rangeof about −12 to about 0° C., while the condensing temperature is in therange of about 40 to about 70° C.

Operating Conditions:

-   -   1. Condensing temperature=45° C., Corresponding outdoor ambient        temperature=35° C.    -   2. Condenser sub-cooling=5.5° C.    -   3. Evaporating temperature=−8° C., Corresponding box        temperature=1.7° C.    -   4. Evaporator Superheat=5.5° C.    -   5. Isentropic Efficiency=65%    -   6. Volumetric Efficiency=100%    -   7. Temperature Rise in Suction Line=10° C.

TABLE 7 Performance in Medium Temperature Refrigeration System DischargeDischarge Pressure Pressure Temperature Evaporator Refrigerant CapacityEfficiency ratio [kPa] Difference [° C.] Glide [° C.] R410A 100% 100%100% 100% 0 0.07 1  96% 102%  99%  92% 11.1 1.76

-   -   -   Table 7 shows the thermodynamic performance of a medium            temperature refrigeration system compared to R410A system.        -   Composition 1 shows 95% or higher capacity and matched            efficiency compared to R410A. This indicates the system            performance is similar to R410A.        -   Composition 1 shows 98%-99% pressure ratio compared to            R410A. This indicates the compressor efficiencies are            similar to R410A, and no changes on R410A compressor are            needed.        -   Composition 1 shows discharge temperature rise close to            10° C. compared to R410A. This indicates good compressor            reliability and there is no risk of oil breakdown or motor            burn-out.        -   Composition 1 shows evaporator glide less than 2° C. This            indicates the evaporator glide does not affect system            performance.

Example 6 Low Temperature Refrigeration System

Description:

Low temperature refrigeration systems are used to freeze food such as inan ice cream machine and freezer. The system usually has anair-to-refrigerant evaporator to chill the food or beverage, areciprocating or rotary compressor, an air-to-refrigerant condenser toexchange heat with the ambient air, and a thermal or electronicexpansion valve. The refrigerant evaporating temperature is in the rangeof about −40 to about −12° C., while the condensing temperature is inthe range of about 40 to about 70° C.

Operating Conditions:

-   -   1. Condensing temperature=55° C., Corresponding outdoor ambient        temperature=35° C.    -   2. Condenser sub-cooling=5° C.    -   3. Evaporating temperature=−23° C., Corresponding box        temperature=1.7° C.    -   4. Evaporator Superheat=5.5° C.    -   5. Isentropic Efficiency=60%    -   6. Volumetric Efficiency=100%    -   7. Temperature Rise in Suction Line=1° C.

TABLE 8 Performance in Low Temperature Refrigeration System DischargeDischarge Pressure Pressure Temperature Evaporator Refrigerant CapacityEfficiency ratio [kPa] Difference [° C.] Glide [° C.] R410A 100% 100%100% 100% 0 0.05 1  99% 104%  99%  92% 17.7 1.53

-   -   -   Table 8 shows the thermodynamic performance of a low            temperature refrigeration system compared to R410A system.        -   Composition 1 shows 98% or higher capacity and matched            efficiency compared to R410A. This indicates the system            performance is similar to R410A.        -   Composition 1 shows 97%-98% pressure ratio compared to            R410A. This indicates the compressor efficiencies are            similar to R410A, and no changes on R410A compressor are            needed.        -   Composition 1 shows evaporator glide less than 2° C. This            indicates the evaporator glide does not affect system            performance.

Example 7 Stabilizers for Refrigerant/Lubricant Thermal StabilityExample

Description:

The use of additives such as stabilizers ensures that the composition ofthe refrigerant and lubricant are effectively unchanged through thenormal operation of the equipment to which it is charged. Refrigerantsand lubricants are typically tested against ASHRAE Standard 97—“SealedGlass Tube Method to Test the Chemical Stability of Materials for Usewithin Refrigerant Systems” to simulate accelerated aging. Aftertesting, the level of halides is used to judge refrigerant stability andthe total acid number (TAN) is used to judge lubricant stability. Inaddition, the lubricant should be clear and colorless, the metals shouldbe shiny (unchanged), and there should be no solids present.

The following experiment is carried out to show the effect of theaddition of a stabilizer on a refrigerant/lubricant composition.

Sealed Tube Test Conditions:

-   -   1. Sealed tubes contain 50% refrigerant and 50% lubricant by        weight    -   2. Refrigerant is as set out in table 9 below    -   3. Lubricant is an ISO 68 POE    -   4. Refrigerant and Lubricant have been degassed    -   5. Refrigerant contains <10 ppm moisture    -   6. Lubricant contains <30 ppm moisture    -   7. Sealed tubes contain coupons of steel, copper and aluminum    -   8. Sealed tubes are placed in oven at 175° C. for 14 days

TABLE 9 Composition of refrigerant HFC-32 HFC-125 CF₃I Trans HFO-Refrigerant (wt %) (wt %) (wt %) 1234ze 1 47.5% 12% 36.5% 4%

TABLE 10 Summary of desired outcome of experiment The aim of theexperiment is to obtain the following results: Lubricant Metals SolidsHalides TAN visual visual present? [ppm] [mgKOH/g] Clear, shiny no <300<3.0 colorless

TABLE 11 Analysis of Refrigerant and Lubricant after Sealed Tube TestingLubricant Metals Solids Halides TAN Comp. Additives visual visualpresent? [ppm] [mg KOH/g] 1 None Opaque, black dull yes >400 >10  2 2%Farnesene + Clear, colorless shiny no <300 <3.0 2% Diphenylphosphite

-   -   -   Sealed tube testing is carried out at 175° C. for 14 days        -   No thermal stability conditions are met with no stabilizer            present        -   With 2 wt % each of Farnesene and Diphenylphosphite all test            conditions are met. This combination of refrigerant,            lubricant and stabilizer is of similar thermal stability to            other commercial refrigerants such as R410A.

Although the invention has been described with reference to preferredembodiments, it will be understood by those skilled in the art thatvarious changes may be made and equivalents substituted for elementsthereof without departing from the scope of the invention. In addition,many modifications may be made to adapt to a particular situation ormaterial to the teachings of the invention with departing from theessential scope thereof. Therefore, it is intended that the inventionnot be limited to the particular embodiments disclosed, but that theinvention will include all embodiments falling within the scope of theappended claims or any claims added later.

The invention claimed is:
 1. A refrigerant comprising: from about 40% byweight to about 49% by weight difluoromethane (HFC-32), from about 6% byweight to about 12% by weight pentafluoroethane (HFC-125), from about33% by weight to about 40% by weight trifluoroiodomethane (CF₃I); andfrom about 2% by weight to about 12% by weight of trans1,3,3,3-tetrafluoropropene (trans HFO-1234ze), provided that togethersaid HFC-32, said HFC-125, said CF3I and said transHFO-1234ze compriseat least about 97% by weight of said refrigerant.
 2. The refrigerant ofclaim 1 wherein the refrigerant is substantially free of CO2.
 3. Therefrigerant of claim 2 wherein together said HFC-32, said HFC-125, saidCF3I and said transHFO-1234ze comprise at least about 98.5% by weight ofsaid refrigerant.
 4. The refrigerant of claim 2 wherein together saidHFC-32, said HFC-125, said CF3I and said transHFO-1234ze comprise atleast about 99.5% by weight of said refrigerant.
 5. The refrigerant ofclaim 1 comprising: from about 46.5% by weight to about 48.5% by weightdifluoromethane (HFC-32), from about 10.5% by weight to about 12% byweight pentafluoroethane (HFC-125), from about 34.5% by weight to about36.5% by weight trifluoroiodomethane (CF₃I); and from about 2% by weightto about 5% by weight of trans 1,3,3,3-tetrafluoropropene (transHFO-1234ze).
 6. The refrigerant of claim 5 wherein the refrigerant issubstantially free of CO2.
 7. The refrigerant of claim 1 comprising;about 47.5% by weight difluoromethane (HFC-32), about 12% by weightpentafluoroethane (HFC-125), about 36.5% by weight trifluoroiodomethane(CF₃I); and about 4% by weight of trans 1,3,3,3-tetrafluoropropene(trans HFO-1234ze).
 8. The refrigerant of claim 7 wherein therefrigerant is substantially free of CO2.
 9. A heat transfer compositioncomprising a refrigerant according to claim
 1. 10. A heat transfercomposition comprising a refrigerant according to claim
 8. 11. The heattransfer composition as claimed in claim 10, wherein the refrigerantcomprises greater than 70% by weight of the heat transfer composition.12. The heat transfer composition of claim 11 further comprising astabilizer.
 13. The heat transfer composition of claim 12 furthercomprising a lubricant selected from the group consisting of polyolesters (POEs), polyalkylene glycols (PAGs), PAG oils, silicone oils,mineral oil, alkylbenzenes (ABs) and poly(alpha-olefin) (PAO).
 14. Theheat transfer composition of claim 13 wherein the lubricant is selectedfrom polyol esters (POEs) and polyalkylene glycols (PAGs).
 15. The heattransfer composition of claim 14 wherein the lubricant is present in theheat transfer composition in an amount of from 10 to 60% by weight. 16.The heat transfer composition of claim 13 wherein said refrigerant has aGlobal Warming Potential (GWP) of not greater than
 750. 17. The heattransfer composition of claim 12 wherein said stabilizer comprises adiene based compound, a phenol, a nitrogen compound, an epoxide andcombinations of two or more of these.
 18. The heat transfer compositionof claim 17 wherein the stabilizer comprises at least BHT.
 19. A methodof cooling in a heat transfer system comprising an evaporator, acondenser and a compressor, the process comprising: i) condensing arefrigerant comprising: from about 40% by weight to about 49% by weightdifluoromethane (HFC-32), from about 6% by weight to about 12% by weightpentafluoroethane (HFC-125), from about 33% by weight to about 40% byweight trifluoroiodomethane (CF₃I); and from about 2% by weight to about12% by weight of trans 1,3,3,3-tetrafluoropropene (trans HFO-1234ze),provided that together said HFC-32, said HFC-125, said CF3I and saidtransHFO-1234ze comprise at least about 97% by weight of saidrefrigerant, and ii) evaporating the refrigerant in the vicinity of thebody or article to be cooled; wherein the evaporator temperature of theheat transfer system is in the range of from about −40° C. to about −10°C.
 20. The method of claim 19 wherein the heat transfer system is an airconditioning system.
 21. The method of claim 20 wherein the airconditioning system is selected from an automobile air conditioningsystem, a chiller, a residential air conditioning system, a residentialheat pump, a residential air to water heat pump/hydronic system, anindustrial air conditioning system and a commercial air conditioningsystem.
 22. A method of heating in a heat transfer system comprising anevaporator, a condenser and a compressor, the process comprising: i)condensing in the vicinity of a body or article to be heated arefrigerant comprising: from about 40% by weight to about 49% by weightdifluoromethane (HFC-32), from about 6% by weight to about 12% by weightpentafluoroethane (HFC-125), from about 33% by weight to about 40% byweight trifluoroiodomethane (CF₃I); and from about 2% by weight to about12% by weight of trans 1,3,3,3-tetrafluoropropene (trans HFO-1234ze),provided that together said HFC-32, said HFC-125, said CF3I and saidtransHFO-1234ze comprise at least about 97% by weight of saidrefrigerant, and ii) evaporating the refrigerant; wherein the evaporatortemperature of the heat transfer system is in the range of about −20° C.to about 3° C.
 23. The method of claim 22 wherein the heat transfersystem is an air conditioning system.
 24. The method of claim 23 whereinthe air conditioning system is selected from an automobile airconditioning system, a chiller, a residential air conditioning system, aresidential heat pump, a residential air to water heat pump/hydronicsystem, an industrial air conditioning system and a commercial airconditioning system.
 25. A method of replacing an existing refrigerantcontained in a heat transfer system comprising removing at least aportion of said existing refrigerant from said system, said existingrefrigerant being R-410A and replacing at least a portion of saidexisting refrigerant by introducing into said system a refrigerantcomprising: from about 40% by weight to about 49% by weightdifluoromethane (HFC-32), from about 6% by weight to about 12% by weightpentafluoroethane (HFC-125), from about 33% by weight to about 40% byweight trifluoroiodomethane (CF₃I); and from about 2% by weight to about12% by weight of trans 1,3,3,3-tetrafluoropropene (trans HFO-1234ze),provided that together said HFC-32, said HFC-125, said CF3I and saidtransHFO-1234ze comprise at least about 97% by weight of saidrefrigerant.
 26. The method of claim 25 wherein the heat transfer systemis an air conditioning system.
 27. The method of claim 26 wherein theair conditioning system is selected from an automobile air conditioningsystem, a chiller, a residential air conditioning system, a residentialheat pump, a residential air to water heat pump/hydronic system, anindustrial air conditioning system and a commercial air conditioningsystem.